add node_modules to address #4364

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+
+# find-index
+
+finds an item in an array matching a predicate function,
+and returns its index
+
+fast both when `thisArg` is used and also when it isn't: [jsPerf](http://jsperf.com/array-prototype-findindex-shims)
+
+### usage
+```bash
+npm install find-index
+```
+```js
+findIndex = require('find-index')
+findLastIndex = require('find-index/last')
+```
+    findIndex(array, callback[, thisArg])
+    findLastIndex(array, callback[, thisArg])
+    Parameters:
+      array
+        The array to operate on.
+      callback
+        Function to execute on each value in the array, taking three arguments:
+          element
+            The current element being processed in the array.
+          index
+            The index of the current element being processed in the array.
+          array
+            The array findIndex was called upon.
+      thisArg
+        Object to use as this when executing callback.
+
+based on [array-findindex](https://www.npmjs.org/package/array-findindex)