ios: requiresMainQueueSetup / readme: typo

* Fixed typo and grammar

* Adds requiresMainQueueSetup

Fixed error being throw `"RNInCallManager requires main queue setup 
since it overrides `init` but doesn't implement `requiresMainQueueSetup`".`

Author: VladyslavKochetkov

README.md

@@ -10,21 +10,21 @@ Handling media-routes/sensors/events during a audio/video chat on React Native
 
 The purpose of this module is to handle actions/events during a phone call (audio/video) on `react-native`, ex:
 
-* Manage devices events like wired-headset plugged in state, proximity sensors and expose functionalities to javascript.
+* Manage devices events like wired-headset plugged-in state, proximity sensors and expose functionalities to javascript.
 * Automatically route audio to proper devices based on events and platform API.
-* Toggle speaker or microphone on/off, toggle flash light on/off
+* Toggle speaker or microphone on/off, toggle flashlight on/off
 * Play ringtone/ringback/dtmftone
 
-Basically, it is a telecommunication module which handles most of requirements when making/receiving/talking with a call.  
+Basically, it is a telecommunication module which handles most of the requirements when making/receiving/talking with a call.  
 
-This module is desinged to work with [react-native-webrtc](https://github.com/oney/react-native-webrtc)  
+This module is designed to work with [react-native-webrtc](https://github.com/oney/react-native-webrtc)  
 
 ## TODO / Contribution Wanted:  
 
-* Make operations run on main thread. ( iOS/Android )  
+* Make operations run on the main thread. ( iOS/Android )  
 * Fix iOS audio shared instance singleton conflict with internal webrtc.  
 * Detect hardware button press event and react to it.  
-  ex: press bluetooth button, send event to JS to answer/hangup.  
+  ex: press bluetooth button, send an event to JS to answer/hangup.  
   ex: press power button to mute incoming ringtone.  
 * Use config-based to decide which event should start and report. maybe control behavior as well.  
 * Flash API on Android.  
@@ -109,7 +109,7 @@ In case `react-native link` doesn't work,
 
 #### Clean project if messed up:
 
-  The installation steps are a bit complex, it might related your xcode version, xcode cache, converting swift version, and your own path configurations. if something messed up, please folow steps below to clean this project, then do it again steps by steps.
+  The installation steps are a bit complex, it might be related your xcode version, xcode cache, converting swift version, and your own path configurations. if something messed up, please follow steps below to clean this project, then do it again steps by steps.
 
   1. Delete all project/directory in xcode related to incall-manager
   2. Delete `react-native-incall-manager` in node_modules ( rm -rf )
@@ -260,10 +260,10 @@ Then you can test it on android 6 now.
 
 If you change targetSdkVersion to 23, the `red box` which React Native used to display errors in development mode requires permission `Draw Over Other Apps`.  
 So in **development mode**, you should manually grant permission in `app settings` on your device or declare `android.permission.SYSTEM_ALERT_WINDOW` in your manifest.  
-You don't have to do this in **release mode** since there are no red box.  
+You don't have to do this in **release mode** since there is no red box.  
 
 
-Checkout this awesome project: [react-native-android-permissions](https://github.com/lucasferreira/react-native-android-permissions) by @lucasferreira for more information.
+Check out this awesome project: [react-native-android-permissions](https://github.com/lucasferreira/react-native-android-permissions) by @lucasferreira for more information.
 
 
 ## Automatic Basic Behavior:
@@ -272,8 +272,8 @@ Checkout this awesome project: [react-native-android-permissions](https://github
 * Store current settings, set KeepScreenOn flag = true, and register some event listeners.
 * If media type is `audio`, route voice to earpiece, otherwise route to speaker.
 * Audio will enable proximity sensor which is disabled by default if media=video
-* When proximity detect user closed to screen, turn off screen to avoid accident touch and route voice to earpiece.
-* When newly external device plugged, such as wired-headset, route audio to external device.
+* When proximity detects user close to screen, turn off screen to avoid accident touch and route voice to the earpiece.
+* When newly external device plugged, such as wired-headset, route audio to an external device.
 * Optional play ringback
 
 **On stop:**  
@@ -323,7 +323,7 @@ Note: iOS only supports `auto` currently.
 | 'onAudioFocusChange' | :smile: | :rage: | see [andriod doc](http://developer.android.com/reference/android/media/AudioManager.OnAudioFocusChangeListener.html#onAudioFocusChange(int)) <br>data: `{'eventText': string, 'eventCode': number }` |
 
 **NOTE: platform OS always has the final decision, so some toggle API may not work in some cases
-be carefull when customize your own behavior**
+be careful when customizing your own behavior**
 
 ## LICENSE:
 

ios/RNInCallManager/RNInCallManager.m

@@ -61,6 +61,11 @@ @implementation RNInCallManager
     NSString *_media;
 }
 
++ (BOOL)requiresMainQueueSetup
+{
+    return NO;
+}
+
 RCT_EXPORT_MODULE(InCallManager)
 
 - (instancetype)init