minSDK in manifest errors the compilation. Fixed (react-native-maps#2472

)

* Fixed compiling with minSDK in manifest file error

When upgrading to newer gradle wrapper package versions that works with buildtools version 28+, error comes up if uses-sdk tag has "minSDK" property defined inside AndroidMainfest.xml file. Default SDK properties should stand only inside build.gradle files.

* Rename mainAndroidManifest.xml to AndroidManifest.xml

* Rename lib/android/src/AndroidManifest.xml to lib/android/src/main/AndroidManifest.xml

lib/android/src/main/AndroidManifest.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.airbnb.android.react.maps" >
-    <uses-sdk android:minSdkVersion="16" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 </manifest>