Update README.md
* Update README.md
Saving an image fails if you don't specify a bucket in command to run locally.
* Update README.md
@@ -9,7 +9,7 @@ Most users can get this running by updating the parameters in `pom.xml`.
### Running Locally
- mvn -Plocal clean appengine:devserver
+ mvn -Plocal clean appengine:devserver -Dbookshelf.bucket=MY-BUCKET.appspot.com
### Deploying to App Engine Standard
