Readme: typo

Author: janpecha

readme.md

@@ -227,7 +227,7 @@ $repo->removeRemote('origin');
 
 // changes remote URL
 $repo->setRemoteUrl('remote-name', 'new-repository-url');
-$repo->removeRemote('upstream', 'https://github.com/czproject/git-php.git');
+$repo->setRemoteUrl('upstream', 'https://github.com/czproject/git-php.git');
 ```
 
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