doc: Add historical release notes for 0.14.3 and 0.15.2

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diff --git a/doc/release-notes/release-notes-0.14.3.md b/doc/release-notes/release-notes-0.14.3.md
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+Bitcoin Core version *0.14.3* is now available from:
+
+  <https://bitcoin.org/bin/bitcoin-core-0.14.3/>
+
+This is a new minor version release, including various bugfixes and
+performance improvements.
+
+Please report bugs using the issue tracker at github:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+Compatibility
+==============
+
+Bitcoin Core is extensively tested on multiple operating systems using
+the Linux kernel, macOS 10.8+, and Windows Vista and later.
+
+Microsoft ended support for Windows XP on [April 8th, 2014](https://www.microsoft.com/en-us/WindowsForBusiness/end-of-xp-support),
+No attempt is made to prevent installing or running the software on Windows XP, you
+can still do so at your own risk but be aware that there are known instabilities and issues.
+Please do not report issues about Windows XP to the issue tracker.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+frequently tested on them.
+
+Notable changes
+===============
+
+Denial-of-Service vulnerability CVE-2018-17144
+ -------------------------------
+
+A denial-of-service vulnerability exploitable by miners has been discovered in
+Bitcoin Core versions 0.14.0 up to 0.16.2. It is recommended to upgrade any of
+the vulnerable versions to 0.14.3, 0.15.2 or 0.16.3 as soon as possible.
+
+Known Bugs
+==========
+
+Since 0.14.0 the approximate transaction fee shown in Bitcoin-Qt when using coin
+control and smart fee estimation does not reflect any change in target from the
+smart fee slider. It will only present an approximate fee calculated using the
+default target. The fee calculated using the correct target is still applied to
+the transaction and shown in the final send confirmation dialog.
+
+0.14.3 Change log
+=================
+
+Detailed release notes follow. This overview includes changes that affect
+behavior, not code moves, refactors and string updates. For convenience in locating
+the code changes and accompanying discussion, both the pull request and
+git merge commit are mentioned.
+
+### Consensus
+- #14247 `52965fb` Fix crash bug with duplicate inputs within a transaction (TheBlueMatt, sdaftuar)
+ 
+### RPC and other APIs
+
+- #10445 `87a21d5` Fix: make CCoinsViewDbCursor::Seek work for missing keys (Pieter Wuille, Gregory Maxwell)
+- #9853 Return correct error codes in setban(), fundrawtransaction(), removeprunedfunds(), bumpfee(), blockchain.cpp (John Newbery)
+
+
+### P2P protocol and network code
+
+- #10234 `d289b56` [net] listbanned RPC and QT should show correct banned subnets (John Newbery)
+
+### Build system
+
+
+### Miscellaneous
+
+- #10451 `3612219` contrib/init/bitcoind.openrcconf: Don't disable wallet by default (Luke Dashjr)
+- #10250 `e23cef0` Fix some empty vector references (Pieter Wuille)
+- #10196 `d28d583` PrioritiseTransaction updates the mempool tx counter (Suhas Daftuar)
+- #9497 `e207342` Fix CCheckQueue IsIdle (potential) race condition and remove dangerous constructors. (Jeremy Rubin)
+
+### GUI
+
+- #9481 `7abe7bb` Give fallback fee a reasonable indent (Luke Dashjr)
+- #9481 `3e4d7bf` Qt/Send: Figure a decent warning colour from theme (Luke Dashjr)
+- #9481 `e207342` Show more significant warning if we fall back to the default fee (Jonas Schnelli)
+
+### Wallet
+
+- #10308 `28b8b8b` Securely erase potentially sensitive keys/values (tjps)
+- #10265 `ff13f59` Make sure pindex is non-null before possibly referencing in LogPrintf call. (Karl-Johan Alm)
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Cory Fields
+- CryptAxe
+- fanquake
+- Jeremy Rubin
+- John Newbery
+- Jonas Schnelli
+- Gregory Maxwell
+- Karl-Johan Alm
+- Luke Dashjr
+- MarcoFalke
+- Matt Corallo
+- Mikerah
+- Pieter Wuille
+- practicalswift
+- Suhas Daftuar
+- Thomas Snider
+- Tjps
+- Wladimir J. van der Laan
+
+And to those that reported security issues:
+
+- awemany (for CVE-2018-17144, previously credited as "anonymous reporter")
+
diff --git a/doc/release-notes/release-notes-0.15.2.md b/doc/release-notes/release-notes-0.15.2.md
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+Bitcoin Core version *0.15.2* is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-0.15.2/>
+
+This is a new minor version release, including various bugfixes and
+performance improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the 
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+The first time you run version 0.15.0 or higher, your chainstate database will
+be converted to a new format, which will take anywhere from a few minutes to
+half an hour, depending on the speed of your machine.
+
+The file format of `fee_estimates.dat` changed in version 0.15.0. Hence, a
+downgrade from version 0.15 or upgrade to version 0.15 will cause all fee
+estimates to be discarded.
+
+Note that the block database format also changed in version 0.8.0 and there is no
+automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
+directly from 0.7.x and earlier without redownloading the blockchain is not supported.
+However, as usual, old wallet versions are still supported.
+
+Downgrading warning
+-------------------
+
+The chainstate database for this release is not compatible with previous
+releases, so if you run 0.15 and then decide to switch back to any
+older version, you will need to run the old release with the `-reindex-chainstate`
+option to rebuild the chainstate data structures in the old format.
+
+If your node has pruning enabled, this will entail re-downloading and
+processing the entire blockchain.
+
+Compatibility
+==============
+
+Bitcoin Core is extensively tested on multiple operating systems using
+the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+frequently tested on them.
+
+
+Notable changes
+===============
+
+Denial-of-Service vulnerability CVE-2018-17144
+-------------------------------
+
+A denial-of-service vulnerability exploitable by miners has been discovered in
+Bitcoin Core versions 0.14.0 up to 0.16.2. It is recommended to upgrade any of
+the vulnerable versions to 0.15.2 or 0.16.3 as soon as possible.
+
+0.15.2 Change log
+=================
+
+### Build system
+
+- #11995 `9bb1a16` depends: Fix Qt build with XCode 9.2(fanquake)
+- #12946 `93b9a61` depends: Fix Qt build with XCode 9.3(fanquake)
+- #13544 `9fd3e00` depends: Update Qt download url (fanquake)
+- #11847 `cb7ef31` Make boost::multi_index comparators const (sdaftuar)
+
+### Consensus
+- #14247 `4b8a3f5` Fix crash bug with duplicate inputs within a transaction (TheBlueMatt, sdaftuar)
+ 
+### RPC
+- #11676 `7af2457` contrib/init: Update openrc-run filename (Luke Dashjr)
+- #11277 `7026845` Fix uninitialized URI in batch RPC requests (Russell Yanofsky)
+ 
+### Wallet
+- #11289 `3f1db56` Wrap dumpwallet warning and note scripts aren't dumped (MeshCollider)
+- #11289 `42ea47d` Add wallet backup text to import*, add* and dumpwallet RPCs (MeshCollider)
+- #11590 `6372a75` [Wallet] always show help-line of wallet encryption calls (Jonas Schnelli)
+
+### bitcoin-tx
+
+- #11554 `a69cc07` Sanity-check script sizes in bitcoin-tx (TheBlueMatt)
+
+### Tests
+- #11277 `3a6cdd4` Add test for multiwallet batch RPC calls (Russell Yanofsky)
+- #11647 `1c8c7f8` Add missing batch rpc calls to python coverage logs (Russell Yanofsky)
+- #11277 `1036c43` Add missing multiwallet rpc calls to python coverage logs (Russell Yanofsky)
+- #11277 `305f768` Limit AuthServiceProxyWrapper.\_\_getattr\_\_ wrapping (Russell Yanofsky)
+- #11277 `2eea279` Make AuthServiceProxy.\_batch method usable (Russell Yanofsky)
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- fanquake
+- Jonas Schnelli
+- Luke Dashjr
+- Matt Corallo
+- MeshCollider
+- Russell Yanofsky
+- Suhas Daftuar
+- Wladimir J. van der Laan
+
+And to those that reported security issues:
+
+- awemany (for CVE-2018-17144, previously credited as "anonymous reporter")
+