Update satooshi/php-coveralls requirement || ^2.0.0

Updates the requirements on [satooshi/php-coveralls](https://github.com/php-coveralls/php-coveralls) to permit the latest version.
- [Release notes](https://github.com/php-coveralls/php-coveralls/releases)
- [Changelog](https://github.com/php-coveralls/php-coveralls/blob/2.1/CHANGELOG.md)
- [Commits](php-coveralls/php-coveralls@v1.0.1...v2.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

composer.json

@@ -42,7 +42,7 @@
     },
     "require-dev" : {
         "phpunit/phpunit": "^7.4.4 || ^8.0.0",
-        "satooshi/php-coveralls": "^1.0.1",
+        "php-coveralls/php-coveralls": "^2.0.0",
         "wa72/simplelogger" : "^1.0",
         "friendsofphp/php-cs-fixer": "^2.15.1",
         "symfony/process": "^3 || ^4",