Improve .travis.yml config and a "real" test

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

.travis.yml

@@ -1,25 +1,20 @@
-dist: trusty
+dist: xenial
 
 language: php
 
 php:
   - 7.1
   - 7.2
   - 7.3
+  - 7.4
   - nightly
 
-sudo: false
-
 install:
   - composer install
 
-after_success:
-  - bash <(curl -s https://codecov.io/bash)
-
 cache:
   directories:
     - $HOME/.composer/cache
 
 script:
-  - find PMAStandard/ -name '*.php' -print0 | xargs -0 -n1 php -l
-#  - ./vendor/bin/phpunit --configuration phpunit.xml
+  - ./vendor/bin/phpcs --standard=PhpMyAdmin -vv | grep -oF "Processing ruleset $(pwd)/PhpMyAdmin/ruleset.xml"