Fix typo

Makefile

@@ -240,7 +240,7 @@ setup-ginkgo: ## Download ginkgo locally
 # go-install-tool will 'go install' any package $2 and install it to $1
 PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
 define go-install-tool
-@[ -f $(1) ] || { \
+[ -f $(1) ] || { \
 set -e ;\
 TMP_DIR=$$(mktemp -d) ;\
 cd $$TMP_DIR ;\