Lint as separate job

Author: abnegate

.travis.yml

@@ -51,6 +51,11 @@ notifications:
   email:
     - [email protected]
 
+jobs:
+  include:
+    - script:
+        - composer lint
+
 before_install:
   - >
     if [ ! -z "${DOCKERHUB_PULL_USERNAME:-}" ]; then
@@ -60,7 +65,6 @@ before_install:
 install:
   - docker --version
   - composer install
-  - composer lint
 
 script:
   - composer test tests/${SDK}Test.php