matrix and script sections updated

Author: s3b4stian

.travis.yml

@@ -1,17 +1,18 @@
 language: php
 php:
-- 7.0.21
+- 7.0
 - 7.1
 - 7.2
 - nightly
 
 matrix:
   allow_failures:
   - php: nightly
-  - php: 7.2
 
 before_script:
 - composer install
 
 script:
-- phpunit
+- ./vendor/bin/phpstan analyse --level 7 src
+- ./vendor/bin/phpunit
+- ./vendor/bin/infection --min-msi=75 --min-covered-msi=75