fix: make file whitespace

Signed-off-by: Terry Howe <terrylhowe@gmail.com>

Makefile

@@ -13,9 +13,9 @@ GOX           = $(GOBIN)/gox
 GOIMPORTS     = $(GOBIN)/goimports
 ARCH          = $(shell go env GOARCH)
 
-ACCEPTANCE_DIR:=../acceptance-testing
+ACCEPTANCE_DIR := ../acceptance-testing
 # To specify the subset of acceptance tests to run. '.' means all tests
-ACCEPTANCE_RUN_TESTS=.
+ACCEPTANCE_RUN_TESTS = .
 
 # go option
 PKG         := ./...
@@ -232,14 +232,11 @@ release-notes:
 		exit 1; \
 	fi
 	@if [ -z "${PREVIOUS_RELEASE}" ]; then \
-			echo "please set PREVIOUS_RELEASE environment variable" \
+		echo "please set PREVIOUS_RELEASE environment variable" && \
-			&& exit 1; \
+		exit 1; \
 	fi
-
 	@./scripts/release-notes.sh ${PREVIOUS_RELEASE} ${VERSION}
 
-
-
 .PHONY: info
 info:
 	@echo "Version:           ${VERSION}"