update CHANGELOG (#19250)

* update CHANGELOG

* fix typo

* fix typo 2

Author: PatriceJiang

Diff for: CHANGELOG

@@ -18,12 +18,15 @@ cocos2d-x-3.17.1 Nov.19 2018
 [REFINE]        Action: add ui::LoadingBar support to Progress actions
 [REFINE]        Network: support multiple parameters in SocketIO emit/send method
 [REFINE]        FileUtils: improve thread safety (use single recursive_mutex)
-[REFINE]        FileUitils: add getFileSize impl for Windows
+[REFINE]        FileUtils: add getFileSize impl for Windows
 [REFINE]        FileUtils: add listFiles impl for Android and Windows platform
+[REFINE]        FileUtils: exact fullPathForDirectory from fullPathForFilename, fullPathForFilename should not accept directory
 [REFINE]        CMake: improve libraries link, compile options config
 [REFINE]        CMake: remove un-elegant prebuilt feature at internal cmake build scripts
 [REFINE]        3rd: upgrade libwebsockets to 2.4.2 with libuv enabled
 [REFINE]        3rd: improve cmake build scripts for external libs
+[REFINE]        3rd: upgrade luajit to 2.1.0-beta3
+[REFINE]        3rd: external/lua/lua is not referenced in cmake and it will be removed in the near future
 [REFINE]        Tests: add websocket latency test
 [REFINE]        Tests: add download multi task test case
 [REFINE]        Tests: improve part test cases UI shows
@@ -54,16 +57,19 @@ cocos2d-x-3.17.1 Nov.19 2018
 [FIX]           Audio: add extra init checks in pcm audio service, avoid crash in PcmAudioService 
 [FIX]           Audio: fix AVAudioSessionErrorCodeCannotStartPlaying error may occur on Apple
 [FIX]           Audio: fix background music may resumes even the application is on the background on Android
+[FIX]           Audio: fix AudioCache* holding invalid pointer value
 [FIX]           Network: fix memory leaks in WebSocket
 [FIX]           Network: fix websocket memory zereoing size error
 [FIX]           Network: fix https downloader timeout on win/mac
 [FIX]           Network: fix "cc.loader.load" convert url error
 [FIX]           iOS: fix project build warnings in Xcode
 [FIX]           iOS: fix crash when saving gray colorspace image
+[FIX]           iOS: `js/lua tests` fix double free issue on app exits. 
 [FIX]           Android: shorten C++ build path, reduce long path error on Windows
 [FIX]           Android: keep cocos2dx activity at task root by mark "singleTask" in manifest
 [FIX]           Android: fix crash caused by JNIEnv null pointer in getStringUTFCharsJNI function
 [FIX]           Android: use 'Binary names' style on JNI for ClassLoader.loadClass
+[FIX]           Android: allow cleartext HTTP traffic by default
 [FIX]           Action: fix repeat CallFunc for some times, may never stop
 [FIX]           Physics: fix PhysicsJointMotor setRate and getRate Bad Access Crash
 [FIX]           FileUtils: fix removeDirectory() failure on win32
@@ -1239,7 +1245,7 @@ cocos2d-x-3.7rc0  July.1 2015
     [NEW]           C++: Added ActionFloat
     [NEW]           C++: Supported physical keyboard on WinRT
     [NEW]           FileUtils: checked filename case characters on windows
-    [NEW]           FileUitls: added supporting loading files that which file path include utf-8 characters
+    [NEW]           FileUtils: added supporting loading files that which file path include utf-8 characters
     [NEW]           PhysicsShape: added sensor property
     [NEW]           Sprite: used triangle command
     [NEW]           3d: Added `getFarPlane` and `getNearPlane` in `Camera` class