new travis config

Author: Stephan Wentz

.travis.yml

@@ -1,19 +1,33 @@
 language: php
 
-php:
-  - 7.1
-  - 7.2
-  - nightly
+sudo: false
 
 matrix:
+  include:
+    - php: 7.1
+      env: COLLECT_COVERAGE=true VALIDATE_CODING_STYLE=true
+    - php: 7.2
+      env: COLLECT_COVERAGE=true VALIDATE_CODING_STYLE=false
+    - php: nightly
+      env: COLLECT_COVERAGE=false VALIDATE_CODING_STYLE=false
   allow_failures:
-    - php:
-        - nightly
+    - php: nightly
+  fast_finish: true
 
-before_script: composer install
+cache:
+  directories:
+    - $HOME/.composer/cache
 
-script: vendor/bin/phpunit --coverage-clover=coverage.clover
+before_install:
+  - travis_retry composer self-update
+
+install:
+  - composer update --no-interaction --prefer-source
+
+script:
+  - vendor/bin/phpunit --coverage-clover=build/clover.xml
 
 after_script:
-  - sh -c 'if [ $(phpenv version-name) = "7.1" ]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi;'
+  - if [ "$COLLECT_COVERAGE" == "true" ]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover build/clover.xml; fi
+  - if [ "$VALIDATE_CODING_STYLE" == "true" ]; then php vendor/bin/phpcs; fi