update README

Author: wzshiming

README.md

@@ -58,7 +58,7 @@ type Gentest struct {
 EOF
 ```
 4. Generated from CRUD template `gen crud -t mock -n Gentest`
-5. Start it `gen run gentest`
+5. Start it `GO111MODULE=off gen run gentest`
 
 ## Supported
 

README_cn.md

@@ -60,7 +60,7 @@ EOF
 4. 根据CRUD模板生成
 `gen crud -t mock -n Gentest`
 5. 启动
-`gen run gentest`
+`GO111MODULE=off gen run gentest`
 
 ## 支持的功能