update flow config to declare react-native imports

Author: Salakar

.flowconfig

@@ -77,7 +77,7 @@
 node_modules/fbjs/lib
 
 [libs]
-js/flow-lib.js
+lib/flow.js
 node_modules/react-native/Libraries/react-native/react-native-interface.js
 node_modules/react-native/flow
 node_modules/fbjs/flow/lib

lib/flow.js

@@ -0,0 +1,4 @@
+declare module 'react-native' {
+  // noinspection ES6ConvertVarToLetConst
+  declare var exports: any;
+}