Updated android build instrctions to platforms directory (Closes andpor#384)

Author: Josh Walker

README.md

@@ -138,7 +138,7 @@ npm install --save react-native-sqlite-storage
 ...
 
 include ':react-native-sqlite-storage'
-project(':react-native-sqlite-storage').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-sqlite-storage/platform/android') // react-native-sqlite-storage >= 4.0.0
+project(':react-native-sqlite-storage').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-sqlite-storage/platforms/android') // react-native-sqlite-storage >= 4.0.0
 // IMPORTANT: if you are working with a version less than 4.0.0 the project directory is '../node_modules/react-native-sqlite-storage/src/android'
 ```