added Codecov badge

[skip ci]

Author: gesinn-it-gea

Diff for: README.md

@@ -1,7 +1,8 @@
 # Semantic Dependency Updater
 [![CI](https://github.com/gesinn-it/SemanticDependencyUpdater/actions/workflows/ci.yml/badge.svg)](https://github.com/gesinn-it/SemanticDependencyUpdater/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/github/gesinn-it-pub/SemanticDependencyUpdater/graph/badge.svg?token=35TWH21ZPJ)](https://codecov.io/github/gesinn-it-pub/SemanticDependencyUpdater)
 
 Semantic Dependency Updater (SDU) is a MediaWiki extension that monitors pages for changes in their semantic data.
-If a Semantic Dependency property is found, SDU will update (null-edit) all pages that have been selected through that property.
+If a Semantic Dependency property is found, SDU will update all pages that have been selected through that property.
 
 See https://www.mediawiki.org/wiki/Extension:SemanticDependencyUpdater for more details.