Triggering image build on Docker Hub after successful travis build

.travis.yml

@@ -15,5 +15,13 @@ before_script:
 script:
   - docker run -t -v $PWD:/app:ro badouralix/zunit zunit test
 
+after_success:
+  # Notify Docker Hub to make a new build
+  # See https://stackoverflow.com/questions/34710513/how-can-i-update-full-description-on-docker-hub-automatically
+  - >
+      [[ $TRAVIS_PULL_REQUEST == "false" && $TRAVIS_BRANCH == "master" ]]
+      && curl -X POST -H "Content-Type: application/json" --data '{"docker_tag_name": "latest"}'
+      https://registry.hub.docker.com/u/badouralix/oh-my-via/trigger/$DOCKER_HUB_TOKEN/
+
 # vim: ts=2 sw=2 sts=2