add CS check against v3

.travis.yml

@@ -36,6 +36,9 @@ matrix:
     - php: 7.0
       env: PHPCS=1 DEFAULT=0
 
+    - php: 7.0
+      env: PHPCS=3 DEFAULT=0
+
     - php: 7.0
       env: PHPSTAN=1 DEFAULT=0
 
@@ -55,6 +58,9 @@ matrix:
     - php: 7.1
       env: PHPSTAN=1 DEFAULT=0
 
+    - php: 7.0
+      env: PHPCS=3 DEFAULT=0
+
 before_install:
   - if [ $HHVM != 1 && $TRAVIS_PHP_VERSION != 7.* ]; then phpenv config-rm xdebug.ini; fi
 
@@ -81,13 +87,15 @@ before_install:
   - set +H
 
 before_script:
-  - composer install --prefer-dist --no-interaction
+  - if [[ $PHPCS != 3 ]]; then composer install --prefer-dist --no-interaction; fi
+  - if [[ $PHPCS = 3 ]]; then composer require --dev  squizlabs/php_codesniffer=3.0.x-dev@dev cakephp/cakephp-codesniffer=3.0.x-dev@dev; fi
 
 script:
   - if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION = 7.0 ]]; then export CODECOVERAGE=1; vendor/bin/phpunit --coverage-clover=clover.xml; fi
   - if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION != 7.0 ]]; then vendor/bin/phpunit; fi
 
   - if [[ $PHPCS = 1 ]]; then vendor/bin/phpcs -p --extensions=php --standard=vendor/cakephp/cakephp-codesniffer/CakePHP ./src ./tests; fi
+  - if [[ $PHPCS = 3 ]]; then vendor/bin/phpcs -p -s --extensions=php --standard=vendor/cakephp/cakephp-codesniffer/CakePHP ./src ./tests; fi
   - if [[ $PHPSTAN = 1 ]]; then composer require --dev phpstan/phpstan:dev-master && vendor/bin/phpstan analyse -c phpstan.neon -l 0 src; fi
 
 after_success: