##### SUMMARY
group contains call to Display.deprecated or AnsibleModule.deprecate and is scheduled for removal

```
b/ansible/inventory/group.py:54:20: ansible-deprecated-version: Deprecated version ('2.10') found in call to Display.deprecated or AnsibleModule.deprecate
```

##### ISSUE TYPE
 - Bug Report

##### COMPONENT NAME
```
b/ansible/inventory/group.py
```

##### ANSIBLE VERSION
```
2.10
```

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### STEPS TO REPRODUCE
N/A

##### EXPECTED RESULTS
N/A

##### ACTUAL RESULTS
N/A

depth = self.depth
        start_depth = self.depth  
        seen = set([])
        unprocessed = set(self.child_groups)
        while unprocessed:
            seen.update(unprocessed)
            depth += 1
            to_process = unprocessed.copy()
            unprocessed = set([])
            for g in to_process:
                if g.depth < depth:
                    g.depth = depth
                    unprocessed.update(g.child_groups)
            if depth - start_depth > len(seen):
                raise AnsibleError("The group named '%s' has a recursive dependency loop." % to_native(self.name))
    def add_host(self, host):