A little issue if you don't mind 

```
  api = MauticApi(host,public,secret)
   api.create_lead(**{'email': 'hamza.hmidi@edu.umi.ac.ma'})
```

this was the code I made gave me this error 

```
 resp = self.session.post(self.base_url + self.endpoint, data=json.dumps(kwargs), headers=      {"Content-Type": "application/json"})
AttributeError: 'MauticApi' object has no attribute 'session'
```
