chore: improve bash line in README (#72)

Author: t-h2o

README.md

@@ -43,7 +43,7 @@ FROM beevelop/cordova:latest
 Releases follow [CalVer (Calendar Versioning)](https://calver.org/) and use `YYYY.MM.MICRO` syntax. The following command helps with tagging a new release:
 
 ```bash
-git tag "v$(date +"%Y").$(date +"%m").$(($(git tag -l "v$(date +"%Y").$(date +"%m").*" | wc -l)+1))"
+echo git tag "v$(date +"%Y.%m").$(($(git tag -l "v$(date +"%Y.%m").*" | wc -l)+1))"
 ```
 
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