Build master branch only

.travis.yml

@@ -1,26 +1,30 @@
 ---
     language: python
     services: docker
-    
+
     env:
       global:
         - MOLECULE_PROJECT_DIR: "$TRAVIS_BUILD_DIR"
         - MOLECULE_ROLE_NAME: "$(basename $TRAVIS_BUILD_DIR)"
         - HCLOUD_TOKEN: "$HCLOUD_TOKEN"
-    
+
     before_script:
       - wget https://raw.githubusercontent.com/nl2go/docker-molecule/2.22-n2g-1.0.0/requirements.txt
       - wget https://raw.githubusercontent.com/nl2go/docker-molecule/2.22-n2g-1.0.0/docker-compose.yml
       - docker-compose up -d
       - docker-compose exec molecule pip install dnspython requests==2.20.1 docker docker-compose hcloud molecule[hetznercloud]
       - docker-compose exec molecule pip install git+https://github.com/pycontribs/molecule-hetznercloud.git@master#egg=molecule-hetznercloud
-    
+
     script:
       - docker-compose exec -e HCLOUD_TOKEN="$HCLOUD_TOKEN" -e USER=root molecule molecule test --all
-    
+
     after_script:
       - docker-compose down
       - codecov
-    
+
     notifications:
-      webhooks: https://galaxy.ansible.com/api/v1/notifications/
+      webhooks: https://galaxy.ansible.com/api/v1/notifications/
+
+    branches:
+      only:
+      - master