add promise.defer dep

package.json

@@ -23,6 +23,7 @@
     "gl-react": "^2.1.0"
   },
   "dependencies": {
-    "invariant": "2.2.0"
+    "invariant": "2.2.0",
+    "promise-defer": "1.0.0"
   }
 }

src/GLCanvas.js

@@ -4,7 +4,7 @@ const {
   Component,
   requireNativeComponent
 } = React;
-
+const defer = require("promise-defer");
 const captureFrame = require("./GLCanvas.captureFrame");
 
 const serializeOption = config =>
@@ -18,16 +18,6 @@ const GLCanvasNative = requireNativeComponent("GLCanvas", GLCanvas, {
   }
 });
 
-function defer() {
-  const deferred = {};
-  const promise = new Promise(function(resolve, reject) {
-    deferred.resolve = resolve;
-    deferred.reject  = reject;
-  });
-  deferred.promise = promise;
-  return deferred;
-}
-
 class GLCanvas extends Component {
 
   componentWillMount () {