Fix travis config syntax

.travis.yml

@@ -12,10 +12,10 @@ script:
   - make test-unit
   - make test-e2e
 
-after-script:
+after_script:
   - make stop
 
-after-success:
+after_success:
   - if [[ "$TRAVIS_BRANCH" == "master" ]]; then
       echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin;
       make build-image;