fix camera roll lint warnings

Summary: fix lint warnings under `Libraries/CameraRoll` directory
Closes https://github.com/facebook/react-native/pull/4445

Reviewed By: svcscm

Differential Revision: D2705430

Pulled By: nicklockwood

fb-gh-sync-id: b5a179750a6696836cf458bc8e646e6b8a23fd98

Libraries/CameraRoll/CameraRoll.js

@@ -120,7 +120,7 @@ class CameraRoll {
    * Saves the image to the camera roll / gallery.
    *
    * The CameraRoll API is not yet implemented for Android.
-   * 
+   *
    * @param {string} tag On Android, this is a local URI, such
    * as `"file:///sdcard/img.png"`.
    *

Libraries/CameraRoll/ImagePickerIOS.js

@@ -24,7 +24,7 @@ var ImagePickerIOS = {
     config = {
       videoMode: false,
       ...config,
-    }
+    };
     return RCTImagePicker.openCameraDialog(config, successCallback, cancelCallback);
   },
   openSelectDialog: function(config: Object, successCallback: Function, cancelCallback: Function) {
@@ -32,7 +32,7 @@ var ImagePickerIOS = {
       showImages: true,
       showVideos: false,
       ...config,
-    }
+    };
     return RCTImagePicker.openSelectDialog(config, successCallback, cancelCallback);
   },
 };