convert to new react native config format (RN 0.60 (react-native-maps#2975)

* convert to new react native config format (RN 0.60

* remove space & replace singlequote

* missing trailing comma & newline at end of file

* remove quote

Author: adhinugraha

package.json

@@ -52,10 +52,5 @@
     "metro-react-native-babel-preset": "^0.53.1",
     "react": "16.8.3",
     "react-native": "0.59.3"
-  },
-  "rnpm": {
-    "android": {
-      "sourceDir": "./lib/android"
-    }
   }
 }

react-native.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  project: {
+    ios: {},
+    android: {
+      sourceDir: './lib/android',
+    },
+  },
+};