Fix behat coverage not generated (#147)

Author: yoanm

composer.json

@@ -35,7 +35,7 @@
     "ext-json": "*"
   },
   "require-dev": {
-    "behat/behat": "^3.9.0",
+      "behat/behat": "^3.9.0,<=3.16.1",
     "coduo/php-matcher": "^6.0",
     "dvdoug/behat-code-coverage": "^5.0",
     "phpspec/prophecy": "^1.15",