Bump coveralls version to 2.2

Author: codeliner

composer.json

@@ -22,7 +22,7 @@
   "require-dev": {
     "phpunit/phpunit": "^7.0",
     "prooph/php-cs-fixer-config": "^0.3",
-    "satooshi/php-coveralls": "^1.0",
+    "satooshi/php-coveralls": "^2.2",
     "malukenho/docheader": "^0.1.4"
   },
   "autoload": {