Update Makefile

Author: shadowabi

Makefile

@@ -9,4 +9,4 @@ build:
 	env CGO_ENABLED=0  GOOS=linux GOARCH=amd64 go build $(BUILD_FLAG) -o $(BUILD_DIR)/EndpointSearch main/main.go
 
 clean:
-	rm -rf ./$(BUILD_FLAG)
+	rm -rf ./$(BUILD_DIR)