修改Makefile

Makefile

@@ -14,9 +14,12 @@ log:
 	@tail -f log/runtime.log
 
 help:
-	@echo "make start   => start server"
-	@echo "make status  => check server status"
-	@echo "make log     => print log"
-	@echo "make help    => help"
+	@echo "Usage: make <target>"
+	@echo ""
+	@echo "make start      Start server"
+	@echo "make status     Check server status"
+	@echo "make log        Print log"
+	@echo "make help       Show this help message"
+	@echo ""
 
 .PHONY: start status help log