Fixing For Android as its giving error on isAvailable()

index.android.js

@@ -11,6 +11,11 @@ var warning = require('warning');
 var SafariViewManager = {
   test: function() {
     warning('Not yet implemented for Android.');
+  },
+  isAvailable() {
+    return new Promise(function(resolve, reject) {
+        resolve(false);
+    });
   }
 };