Fix makefile typo

Author: jmattheis

Makefile

@@ -92,7 +92,7 @@ build-docker-arm-7: require-version
 		-t gotify/server-arm7:$(shell echo $(VERSION) | cut -d '.' -f -1) \
 		-t ghcr.io/gotify/server-arm7:latest \
 		-t ghcr.io/gotify/server-arm7:${VERSION} \
-		-t ghcr.io/gotify/server-arm7:$(shell echo $(VERSION) | cut -d '.' -f -2) \ 
+		-t ghcr.io/gotify/server-arm7:$(shell echo $(VERSION) | cut -d '.' -f -2) \
 		-t ghcr.io/gotify/server-arm7:$(shell echo $(VERSION) | cut -d '.' -f -1) .
 	rm ${DOCKER_DIR}gotify-app