Merge pull request #155 from chuongle/master

Add CALL_PHONE Permission for Android.

README.md

 - Photos
 - Contacts
 - Events
+- Call Phone *(Android Only)*
 - Reminders *(iOS only)*
 - Bluetooth *(iOS only)*
 - Push Notifications *(iOS only)*
 |`backgroundRefresh`| ✔️ | ❌ |
 |`speechRecognition`| ✔️ | ❌ |
 |`storage`| ❌️ | ✔ |
+|`callPhone`| ❌️ | ✔ |
 
 ### Methods
 | Method Name | Arguments | Notes

index.android.js

 	event: RNPermissions.PERMISSIONS.READ_CALENDAR,
 	storage: RNPermissions.PERMISSIONS.READ_EXTERNAL_STORAGE,
 	photo: RNPermissions.PERMISSIONS.READ_EXTERNAL_STORAGE,
+	call_phone: RNPermissions.PERMISSIONS.CALL_PHONE,
 }
 
 const RESULTS = {