Update go dependencies

vendor/github.com/imkira/go-interpol/Makefile

@@ -0,0 +1,21 @@
+.PHONY: all deps gometalinter test cover
+
+all: gometalinter test cover
+
+deps:
+	go get -u github.com/alecthomas/gometalinter
+	gometalinter --install
+
+gometalinter:
+	gometalinter --vendor --deadline=1m --tests \
+		--enable=gofmt \
+		--enable=goimports \
+		--enable=lll \
+		--enable=misspell \
+		--enable=unused
+
+test:
+	go test -v -race -cpu=1,2,4 -coverprofile=coverage.txt -covermode=atomic -benchmem -bench .
+
+cover:
+	go tool cover -html=coverage.txt -o coverage.html