Add recursive flag
Add recursive flag for the 'chown' command.
@@ -78,7 +78,7 @@ $ git clone https://github.com/hyperledger/cello.git
```
* If there is any error or you still cannot register, change the permission of the folder
```bash
- $ sudo chown !(whoami): /opt/cello
+ $ sudo chown -R !(whoami): /opt/cello
```
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