Append commits since last tag (#18)

* Append the number of commits since the last tag to the version

* Only print the version not the command

Co-authored-by: Jim Weinert <jweinert@digitalocean.com>

Makefile

@@ -14,7 +14,7 @@ build: vendor
 	go build -ldflags=${go_ldflags} -o bin/felix cmd/felix/main.go
 
 version:
-	echo ${version}
+	@echo ${version}
 
 vendor:
 	go mod tidy