Merge pull request #15 from genert/renovate/pin-dependencies

chore(deps): pin dependency phpunit/phpunit to 6.5.14

Author: genert

composer.json

@@ -22,7 +22,7 @@
     "minimum-stability": "stable",
     "require": {},
     "require-dev": {
-        "phpunit/phpunit": "^6.1"
+        "phpunit/phpunit": "6.5.14"
     },
     "scripts": {
         "test": "phpunit --coverage-text"