修改readme

README.md

@@ -8,6 +8,12 @@ conda install fiona
 pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
 ```
 
+Centos7安装open3d失败执行
+
+```bash
+conda install -c conda-forge open3d
+```
+
 ## TODO
 
 - command_runner中rerun需要更新