Require PHP 5.6 + Updated Travis

Changes for Travis:
- Added PHP 7.1;
- Removed HHVM;

.travis.yml

@@ -1,10 +1,9 @@
 language: php
 
 php:
-    - 5.5
     - 5.6
     - 7.0
-    - hhvm
+    - 7.1
     - nightly
 
 env:
@@ -14,12 +13,10 @@ env:
 
 matrix:
     allow_failures:
-        - php: 7.0
-        - php: hhvm
         - php: nightly
 
 before_script:
-    ## Init composer
+    ## Init Composer
     - composer selfupdate --quiet
     - composer install -n --dev
 
@@ -30,8 +27,8 @@ script:
     ## Lint PHP Files
     - find {src,tests} -name '*.php' -print0 | xargs -0 -n1 -P8 php -l | grep -v '^No syntax errors detected'; test $? -eq 1
 
-    ## PHP Code Sniffer
-    - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then ./vendor/bin/phpcs -ps --colors --standard=phpcs.xml src/; fi
+    ## Run PHP Code Sniffer
+    - ./vendor/bin/phpcs --config-set ignore_warnings_on_exit 1;./vendor/bin/phpcs -ps --colors --standard=phpcs.xml src/
 
     ## Run PHPUnit Tests
     - phpunit --configuration ./tests/phpunit.xml --coverage-text --coverage-clover build/logs/clover.xml

composer.json

@@ -22,7 +22,7 @@
         }
     },
     "require": {
-        "php": ">=5.5.0",
+        "php": ">=5.6.0",
         "psr/log": "^1.0",
         "psr/http-message": "^1.0",
         "locomotivemtl/charcoal-config": "~0.6"