chore(readme): more documentation

.gitlab-ci.yml

+variables:
+  DISABLE_ACCEPTANCE: "1"
+  DISABLE_FUNCTIONAL: "1"
+  IS_LIBRARY: 1
+  DISABLE_PHP_5_5: 1
+  DISABLE_CODECEPTION: 1
+
+include: 'https://gitlab.com/wpdesk/gitlab-ci/raw/master/gitlab-ci-1.2.yml'

README.md

@@ -5,7 +5,7 @@
 [![License](https://poser.pugx.org/wpdesk/wp-wpdesk-rating-petition/license)](https://packagist.org/packages/wpdesk/wp-wpdesk-rating-petition)
 
 WordPress Library to ask for good rate in repository.
-===================================================
+====================================================
 
 ## Requirements