feat: update to go modules

vendor/github.com/zorkian/go-datadog-api/Makefile

@@ -1,40 +0,0 @@
-TEST?=$$(go list ./... | grep -v '/go-datadog-api/vendor/')
-VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
-GOFMT_FILES?=$$(find . -name '*.go' | grep -v vendor)
-
-default: test fmt
-
-generate:
-	go generate
-
-# test runs the unit tests and vets the code
-test:
-	go test . $(TESTARGS) -v -timeout=30s -parallel=4
-	@$(MAKE) vet
-
-# testacc runs acceptance tests
-testacc:
-	go test integration/* -v $(TESTARGS) -timeout 90m
-
-# testrace runs the race checker
-testrace:
-	go test -race $(TEST) $(TESTARGS)
-
-fmt:
-	gofmt -w $(GOFMT_FILES)
-
-# vet runs the Go source code static analysis tool `vet` to find
-# any common errors.
-vet:
-	@go tool vet 2>/dev/null ; if [ $$? -eq 3 ]; then \
-		go get golang.org/x/tools/cmd/vet; \
-	fi
-	@echo "go tool vet $(VETARGS)"
-	@go tool vet $(VETARGS) $$(ls -d */ | grep -v vendor) ; if [ $$? -eq 1 ]; then \
-		echo ""; \
-		echo "Vet found suspicious constructs. Please check the reported constructs"; \
-		echo "and fix them if necessary before submitting the code for review."; \
-		exit 1; \
-	fi
-
-.PHONY: default test testacc updatedeps vet