Apply coding standards.

.travis.yml

@@ -1,29 +1,26 @@
 language: php
 
 php:
-  - "5.4"
-  - "5.5"
-  - "5.6"
-  - "7.0"
-  - "nightly"
+  - "7.1"
 
 env:
-  - CONTAO_VERSION=~3.5.1
+  - CONTAO_VERSION=contao/core-bundle ~4.4.0
+
+matrix:
+  exclude:
 
 sudo: false
 
 install:
   - travis_retry composer self-update && composer --version
-  - travis_retry composer require contao/core $CONTAO_VERSION --no-update
+  - travis_retry composer require $CONTAO_VERSION --no-update
   - travis_retry composer update --prefer-dist --no-interaction
 
 script: ant -keep-going
 
-matrix:
-  allow_failures:
-    - php: "7.0"
-    - php: "nightly"
-
-# Hack to make things work again - we can not use a shallow repository.
 git:
   depth: 2147483647
+
+cache:
+  directories:
+    - vendor