Fix typo

Author: rszamszur

template/README.md.jinja

@@ -11,7 +11,7 @@ Prerequisites:
 * Git 2.27 or newer
 
 ```shell
-git clone "https://github.com/fastapi-mvc/copier-generator.git"
+git clone "{{repo_url}}.git"
 FMVC_PATH="$PWD:$FMVC_PATH" fastapi-mvc generate {{generator_name}} /path/to/your/new/{{generator_name}}
 ```