diff --git a/Makefile b/Makefile
index af93987..c254bbd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,66 +1,66 @@
-GO    := GO15VENDOREXPERIMENT=1 go
-PROMU := $(GOPATH)/bin/promu
-pkgs   = $(shell $(GO) list ./... | grep -v /vendor/)
-
-PREFIX                  ?= $(shell pwd)
-BIN_DIR                 ?= $(shell pwd)
-DOCKER_IMAGE_NAME       ?= nginx-vts-exporter
-DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
-TAG 					:= $(shell echo `if [ "$(TRAVIS_BRANCH)" = "master" ] || [ "$(TRAVIS_BRANCH)" = "" ] ; then echo "latest"; else echo $(TRAVIS_BRANCH) ; fi`)
-
-all: format build test
-
-style:
-	@echo ">> checking code style"
-	@! gofmt -d $(shell find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'
-
-test:
-	@echo ">> running tests"
-	@$(GO) test -short $(pkgs)
-
-format:
-	@echo ">> formatting code"
-	@$(GO) fmt $(pkgs)
-
-vet:
-	@echo ">> vetting code"
-	@$(GO) vet $(pkgs)
-
-build: promu
-	@echo ">> building binaries"
-	@$(PROMU) build --prefix $(PREFIX)
-
-crossbuild: promu
-	@echo ">> crossbuilding binaries"
-	@$(PROMU) crossbuild
-
-tarball: promu
-	@echo ">> building release tarball"
-	@$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)
-
-docker:
-	@echo ">> building docker image"
-	@docker build -t "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
-
-push:
-	@echo ">> pushing docker image, $(DOCKER_USER),$(DOCKER_IMAGE_NAME),$(TAG)"
-	@echo $(DOCKER_PASS) | docker login -u "$(DOCKER_USER)" --password-stdin
-	@docker tag "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
-	@docker push "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
-
-release: promu github-release
-	@echo ">> pushing binary to github with ghr"
-	@$(PROMU) crossbuild tarballs
-	@$(PROMU) release .tarballs
-
-promu:
-	@GOOS=$(shell uname -s | tr A-Z a-z) \
-		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
-		$(GO) get -u github.com/prometheus/promu
-
-github-release:
-	@GOOS=$(shell uname -s | tr A-Z a-z) \
-		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
-		$(GO) get -u github.com/aktau/github-release
-
-.PHONY: all style format build test vet tarball docker promu
+GO    := GO111MODULE=on go
+PROMU := $(GOPATH)/bin/promu
+pkgs   = $(shell $(GO) list ./... | grep -v /vendor/)
+
+PREFIX                  ?= $(shell pwd)
+BIN_DIR                 ?= $(shell pwd)
+DOCKER_IMAGE_NAME       ?= nginx-vts-exporter
+DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
+TAG 					:= $(shell echo `if [ "$(TRAVIS_BRANCH)" = "master" ] || [ "$(TRAVIS_BRANCH)" = "" ] ; then echo "latest"; else echo $(TRAVIS_BRANCH) ; fi`)
+
+all: format build test
+
+style:
+	@echo ">> checking code style"
+	@! gofmt -d $(shell find . -path ./vendor -prune -o -name '*.go' -print) | grep '^'
+
+test:
+	@echo ">> running tests"
+	@$(GO) test -short $(pkgs)
+
+format:
+	@echo ">> formatting code"
+	@$(GO) fmt $(pkgs)
+
+vet:
+	@echo ">> vetting code"
+	@$(GO) vet $(pkgs)
+
+build: promu
+	@echo ">> building binaries"
+	@$(PROMU) build --prefix $(PREFIX)
+
+crossbuild: promu
+	@echo ">> crossbuilding binaries"
+	@$(PROMU) crossbuild
+
+tarball: promu
+	@echo ">> building release tarball"
+	@$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)
+
+docker:
+	@echo ">> building docker image"
+	@docker build -t "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
+
+push:
+	@echo ">> pushing docker image, $(DOCKER_USER),$(DOCKER_IMAGE_NAME),$(TAG)"
+	@echo $(DOCKER_PASS) | docker login -u "$(DOCKER_USER)" --password-stdin
+	@docker tag "$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
+	@docker push "$(DOCKER_USER)/$(DOCKER_IMAGE_NAME):$(TAG)"
+
+release: promu github-release
+	@echo ">> pushing binary to github with ghr"
+	@$(PROMU) crossbuild tarballs
+	@$(PROMU) release .tarballs
+
+promu:
+	@GOOS=$(shell uname -s | tr A-Z a-z) \
+		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
+		$(GO) get -u github.com/prometheus/promu
+
+github-release:
+	@GOOS=$(shell uname -s | tr A-Z a-z) \
+		GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m))) \
+		$(GO) get -u github.com/aktau/github-release
+
+.PHONY: all style format build test vet tarball docker promu