composer update

Author: adapik

composer.json

@@ -30,7 +30,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "~6.2",
-        "satooshi/php-coveralls": "dev-master"
+        "satooshi/php-coveralls": "~2.0"
     },
     "suggest": {
         "php-curl": "For loading OID information from the web if they have not bee defined statically"