migrate from govendor to dep

vendor/github.com/sergi/go-diff/Makefile

@@ -0,0 +1,44 @@
+.PHONY: all clean clean-coverage install install-dependencies install-tools lint test test-verbose test-with-coverage
+
+export ARGS := $(wordlist 2,$(words $(MAKECMDGOALS)),$(MAKECMDGOALS))
+export PKG := github.com/sergi/go-diff
+export ROOT_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
+
+$(eval $(ARGS):;@:) # turn arguments into do-nothing targets
+export ARGS
+
+ifdef ARGS
+	PKG_TEST := $(ARGS)
+else
+	PKG_TEST := $(PKG)/...
+endif
+
+all: install-tools install-dependencies install lint test
+
+clean:
+	go clean -i $(PKG)/...
+	go clean -i -race $(PKG)/...
+clean-coverage:
+	find $(ROOT_DIR) | grep .coverprofile | xargs rm
+install:
+	go install -v $(PKG)/...
+install-dependencies:
+	go get -t -v $(PKG)/...
+	go build -v $(PKG)/...
+install-tools:
+	# Install linting tools
+	go get -u -v github.com/golang/lint/...
+	go get -u -v github.com/kisielk/errcheck/...
+
+	# Install code coverage tools
+	go get -u -v github.com/onsi/ginkgo/ginkgo/...
+	go get -u -v github.com/modocache/gover/...
+	go get -u -v github.com/mattn/goveralls/...
+lint:
+	$(ROOT_DIR)/scripts/lint.sh
+test:
+	go test -race -test.timeout 120s $(PKG_TEST)
+test-verbose:
+	go test -race -test.timeout 120s -v $(PKG_TEST)
+test-with-coverage:
+	ginkgo -r -cover -race -skipPackage="testdata"