style: fix typo

Makefile

@@ -19,7 +19,7 @@ GIT_COMMIT = $(strip $(shell git rev-parse --short HEAD))
 ####################
 BUILD_ARGS := --build-arg VCS_REF=$(GIT_COMMIT)
 
-.PHONY: all clean test $(DOCKERFILES) clean_images $(IMAGES_TO_CLEAN) static-code-analysis delete_danglig_images
+.PHONY: all clean test $(DOCKERFILES) clean_images $(IMAGES_TO_CLEAN) static-code-analysis delete_dangling_images
 
 all: \
 	php-lint_5.6 php-lint_7.0 php-lint_7.1 php-lint_7.2 php-lint_latest \
@@ -69,12 +69,12 @@ $(DOCKERFILES):
 	@docker run --rm -i nimmis/label-inspector lint < $(@D)/Dockerfile
 	@docker run --rm -i nimmis/label-inspector validate < $(@D)/Dockerfile
 
-clean_images: $(IMAGES_TO_CLEAN) delete_danglig_images
+clean_images: $(IMAGES_TO_CLEAN) delete_dangling_images
 $(IMAGES_TO_CLEAN):
 	@echo "Uninstalling $@"
 	@docker rmi $(shell docker  images --format '{{.Repository}}:{{.Tag}}'  --filter reference=$@)
 
-delete_danglig_images:
+delete_dangling_images:
 	@echo "Removing dangling images"
 	@docker image prune -f
 help: