run phpstan only on one instance

Author: makasim

.travis.yml

@@ -8,6 +8,9 @@ matrix:
     - php: 5.6
       sudo: false
       env: SYMFONY_VERSION=2.8.* FUNCTIONAL_TESTS=false
+    - php: 7.1
+      sudo: false
+      env: SYMFONY_VERSION=3.0.* FUNCTIONAL_TESTS=false PHPSTAN=true
     - php: 7.0
       sudo: false
       env: SYMFONY_VERSION=2.8.* FUNCTIONAL_TESTS=false
@@ -35,7 +38,7 @@ install:
     - echo "memory_limit=2048M" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
     - composer install --ignore-platform-reqs # ext-amqp is not installed
-    - ./bin/phpstan analyse -l 1 -c phpstan.neon pkg/enqueue
+    - if [ "PHPSTAN" = true ]; then ./bin/phpstan analyse -l 1 -c phpstan.neon pkg/enqueue; fi
     - if [ "$FUNCTIONAL_TESTS" = true ]; then docker --version; fi
     - if [ "$FUNCTIONAL_TESTS" = true ]; then docker-compose --version; fi
     - if [ "$FUNCTIONAL_TESTS" = true ]; then bin/dev -b; fi