chore: update makefile (#42)

Makefile

@@ -1 +1,23 @@
-include github.com/hamba/make/golang
+# Format all files
+fmt:
+	@echo "==> Formatting source"
+	@gofmt -s -w $(shell find . -type f -name '*.go' -not -path "./vendor/*")
+	@echo "==> Done"
+.PHONY: fmt
+
+# Tidy the go.mod file
+tidy:
+	@echo "==> Cleaning go.mod"
+	@go mod tidy
+	@echo "==> Done"
+.PHONY: tidy
+
+# Run all tests
+test:
+	@go test -cover -race ./...
+.PHONY: test
+
+# Lint the project
+lint:
+	@golangci-lint run ./...
+.PHONY: lint