Remove the need for array.find polyfill

2.0.0 was causing errors on older node versions, and it wasn't worth the trouble

package.json

@@ -84,7 +84,6 @@
     "whatwg-fetch": "^0.11.0"
   },
   "dependencies": {
-    "array.prototype.find": "^2.0.0",
     "load-script": "^1.0.0",
     "query-string": "^3.0.0"
   },

test/mocha/ReactPlayer.js

@@ -2,7 +2,6 @@ import React from 'react'
 import { describe, it, beforeEach } from 'mocha'
 import { expect } from 'chai'
 import { createRenderer } from 'react-addons-test-utils'
-import 'array.prototype.find'
 
 import ReactPlayer from '../../src/ReactPlayer'
 import YouTube from '../../src/players/YouTube'
@@ -25,32 +24,37 @@ describe('ReactPlayer', () => {
   it('renders YouTube player', () => {
     shallowRenderer.render(<ReactPlayer url={YOUTUBE_URL} />)
     const result = shallowRenderer.getRenderOutput()
-    const activePlayer = getActivePlayer(result)
+    const activePlayer = getActivePlayer(result.props.children)
     expect(activePlayer.type).to.equal(YouTube)
   })
 
   it('renders SoundCloud player', () => {
     shallowRenderer.render(<ReactPlayer url={SOUNDCLOUD_URL} />)
     const result = shallowRenderer.getRenderOutput()
-    const activePlayer = getActivePlayer(result)
+    const activePlayer = getActivePlayer(result.props.children)
     expect(activePlayer.type).to.equal(SoundCloud)
   })
 
   it('renders Vimeo player', () => {
     shallowRenderer.render(<ReactPlayer url={VIMEO_URL} />)
     const result = shallowRenderer.getRenderOutput()
-    const activePlayer = getActivePlayer(result)
+    const activePlayer = getActivePlayer(result.props.children)
     expect(activePlayer.type).to.equal(Vimeo)
   })
 
   it('renders FilePlayer', () => {
     shallowRenderer.render(<ReactPlayer url={FILE_URL} />)
     const result = shallowRenderer.getRenderOutput()
-    const activePlayer = getActivePlayer(result)
+    const activePlayer = getActivePlayer(result.props.children)
     expect(activePlayer.type).to.equal(FilePlayer)
   })
 })
 
-function getActivePlayer (result) {
-  return result.props.children.find(player => player.ref === 'player')
+function getActivePlayer (children) {
+  for (let i = 0; i !== children.length; i++) {
+    if (children[i].ref === 'player') {
+      return children[i]
+    }
+  }
+  return null
 }