build(Makefile): add -buildmode=pie to go build flags

Makefile

@@ -1,11 +1,19 @@
+.PHONY: build
 build:
-	go build -trimpath -ldflags "-s -w" .
+	go build \
+		-trimpath \
+		-buildmode=pie \
+		-ldflags "-s -w" \
+		.
 
+.PHONY: test
 test:
 	go test -v ./...
 
+.PHONY: fmt
 fmt:
 	gofmt -d -e -s .
 
+.PHONY: clean
 clean:
-	go clean
+	go clean