docs(readme): Fix readme link to parent package

Author: zlodes

README.md

@@ -84,7 +84,7 @@ $this->callAfterResolving(
 ```
 
 > **Note**
-> For further details, see [zlodes/prometheus-exporter](https://github.com/zlodes/php-prometheus-exporter)
+> For further details, see [zlodes/prometheus-client](https://github.com/zlodes/php-prometheus-client)
 
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