* Added support of new feature flag rules:
- [`get_feature_variation_key`](https://developers.kameleoon.com/python-sdk.html#get_feature_variation_key)
- [`get_feature_variable`](https://developers.kameleoon.com/python-sdk.html#get_feature_variable)
- [`get_feature_all_variables`](https://developers.kameleoon.com/python-sdk.html#get_feature_all_variables)
- `activate_feature` -> [`is_feature_active`](https://developers.kameleoon.com/python-sdk.html#is_feature_active)
* Renaming of methods (old methods warn you on using and will be removed later)
- `obtain_visitor_code` -> [`get_visitor_code`](https://developers.kameleoon.com/python-sdk.html#get_visitor_code)
- `obtain_variation_associated_data` -> [`get_variation_associated_data`](https://developers.kameleoon.com/python-sdk.html#get_variation_associated_data),
- `obtain_feature_all_variables` -> [`get_feature_all_variables`](https://developers.kameleoon.com/python-sdk.html#get_feature_all_variables),
- `obtain_experiment_list` -> [`get_experiment_list`](https://developers.kameleoon.com/python-sdk.html#get_experiment_list) & [`get_experiment_list_for_visitor`](https://developers.kameleoon.com/python-sdk.html#get_experiment_list_for_visitor),
- `obtain_feature_list` -> [`get_feature_list`](https://developers.kameleoon.com/python-sdk.html#get_feature_list) & [`get_active_feature_list_for_visitor`](https://developers.kameleoon.com/python-sdk.html#get_active_feature_list_for_visitor),
* Renaming of exceptions:
- `NotActivated` -> `NotAllocated`
* Added possibility to set [`UserAgent`](https://developers.kameleoon.com/python-sdk.html#useragent).
* Removed `blocking` parameter (blocking mode) [`KameleoonClient`](https://developers.kameleoon.com/python-sdk.html#initializing-the-kameleoon-client) init method