Update dependencies

Author: ksassnowski

composer.json

@@ -14,7 +14,7 @@
         "pda/pheanstalk": "^4.0"
     },
     "require-dev": {
-        "phpspec/phpspec": "^3.0"
+        "phpspec/phpspec": "^5.0"
     },
     "autoload": {
         "psr-4": {