Run phpstan on PHP >= 7.1 (sabre-io#483)

.travis.yml

@@ -1,39 +1,30 @@
 language: php
-sudo: required
 php:
   - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
   - 7.3
-  - 7.4snapshot
-
-env:
-  global:
-    - RUN_PHPSTAN="FALSE"
+  - 7.4
 
 matrix:
-  include:
-    - name: 'PHPStan'
-      php: 7.2
-      env: RUN_PHPSTAN="TRUE"
   fast_finish: true
   allow_failures:
     - php: 5.5
     - php: 7.2
       env: RUN_PHPSTAN="TRUE"
 
 install:
-  - if [ $RUN_PHPSTAN == "TRUE"  ]; then wget https://github.com/phpstan/phpstan/releases/download/0.11.8/phpstan.phar; fi
+  - if [[ $TRAVIS_PHP_VERSION =~ ^7\.1|7\.2|7\.3|7\.4$ ]]; then wget https://github.com/phpstan/phpstan/releases/download/0.12.3/phpstan.phar; fi
 
 before_script:
   - composer install
 
 script:
-  - if [ $RUN_PHPSTAN == "FALSE"  ]; then ./bin/phpunit --configuration tests/phpunit.xml --coverage-clover=coverage.xml; fi
-  - if [ $RUN_PHPSTAN == "TRUE"  ]; then php phpstan.phar analyse -c phpstan.neon lib; fi
-
+  - if [[ $TRAVIS_PHP_VERSION =~ ^7\.1|7\.2|7\.3|7\.4$ ]]; then php phpstan.phar analyse -c phpstan.neon lib; fi
+  - ./bin/phpunit --configuration tests/phpunit.xml --coverage-clover=coverage.xml
+  
 after_success:
   - bash <(curl -s https://codecov.io/bash)