[-] remove doulbe git checkout from README.md (#942)

Signed-off-by: Daniel Chambre <smiyc@pm.me>

Author: smiyc

README.md

@@ -37,7 +37,7 @@ For the fastest development and deployment experience the Docker compose files a
     ```shell
     git clone https://github.com/cybertec-postgresql/pgwatch.git && cd pgwatch
 
-    git checkout git checkout v3.7.0 # or any other version you want to use
+    git checkout v3.7.0 # or any other version you want to use
 
     docker compose -f ./docker/docker-compose.yml up --detach
     ```