Misc: Added PHPUnit's Code Coverage 3.0 as a dependency.

Author: udan11

composer.json

@@ -18,7 +18,7 @@
         "php": ">=5.5.0"
     },
     "require-dev": {
-        "phpunit/php-code-coverage": "~2.0",
+        "phpunit/php-code-coverage": "~2.0 || ~3.0",
         "phpunit/phpunit": "~4.8 || ~5.1"
     },
     "autoload": {