Drop PHP 5.6 testing

Author: webflo

.travis.yml

@@ -3,7 +3,6 @@ dist: trusty
 sudo: false
 
 php:
-  - 5.6
   - 7.0
   - 7.1
   - 7.2
@@ -18,13 +17,6 @@ env:
     - RELEASE=dev COMPOSER_CHANNEL=stable
     - RELEASE=stable COMPOSER_CHANNEL=snapshot
 
-matrix:
-  exclude:
-    - php: 5.6
-      env: RELEASE=dev COMPOSER_CHANNEL=stable
-    - php: 5.6
-      env: RELEASE=stable COMPOSER_CHANNEL=snapshot
-
 before_install:
   - if [[ $TRAVIS_PHP_VERSION = 5.6 ]]; then export COMPOSER_MEMORY_LIMIT=-1; fi;
   - echo 'sendmail_path = /bin/true' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini