sed in place

Makefile

@@ -130,4 +130,4 @@ new-alert: ## Create an example alert and working alert unit test
 
 .PHONY: set-version-and-fetch-docker-container
 set-version-and-fetch-docker-container: build-cwd hub-tagged # Lock the release of MozDef by pulling the docker containers on AMI build and caching replace all instances of latest in the compose override with the BRANCH
-	sed s/latest/$(BRANCH)/g docker/compose/docker-compose-cloudy-mozdef.yml
+	sed -i s/latest/$(BRANCH)/g docker/compose/docker-compose-cloudy-mozdef.yml