Merge pull request #120 from gyfelton/patch-1

Change to right API call when check multiple permissions

README.md

 
   //check the status of multiple permissions
   _checkCameraAndPhotos() {
-    Permissions.check(['camera', 'photo'])
+    Permissions.checkMultiple(['camera', 'photo'])
       .then(response => {
         //response is an object mapping type to permission
         this.setState({