fix double quotes

android/build.gradle

@@ -37,7 +37,7 @@ android {
 }
 
 dependencies {
-    compile 'com.facebook.react:react-native:${safeExtGet('reactNativeVersion', '+')}'
+    compile "com.facebook.react:react-native:${safeExtGet('reactNativeVersion', '+')}"
     //compile 'com.squareup.okhttp3:okhttp:+'
     //{RNFetchBlob_PRE_0.28_DEPDENDENCY}
 }