fix(readme): fix variable name

README.md

@@ -52,7 +52,7 @@ Create a configuration file named .promoter.yaml in your home directory (~/.prom
 git-email: <Your Git Email>
 git-name: <Your Git Name>
 manifest-repo: <Config Files Repo URL>
-ssh-key-path: <Git SSH Key Path>
+ssh-key: <Git SSH Key Path>
 region: <Region of Your Container Registry>
 manifest-repo-root: < ** OPTIONAL ** For app of apps repos>
 ```