Facebook 5.9.0 (#12)

* iOS 5.9.0
* Android 5.9.0
* Added upgrade instructions for Android
* Added/update proguard files

Author: britzl

facebook/ext.manifest

@@ -9,16 +9,19 @@ platforms:
         context:
             frameworks: ['Security']
             weakFrameworks: ['Accounts', 'Social', 'AdSupport']
+            flags: ['-fcxx-modules', '-fmodules']
             linkFlags: ['-ObjC']
 
     arm64-ios:
         context:
             frameworks: ['Security']
             weakFrameworks: ['Accounts', 'Social', 'AdSupport']
+            flags: ['-fcxx-modules', '-fmodules']
             linkFlags: ['-ObjC']
 
     x86_64-ios:
         context:
             frameworks: ['Security']
             weakFrameworks: ['Accounts', 'Social', 'AdSupport']
+            flags: ['-fcxx-modules', '-fmodules']
             linkFlags: ['-ObjC']