[release] 0.38.0 - Evaluator Improvement and API Overrides (#292)

### New Features
- New options to override the URL hosts for get_id_lists and log_event
requests
  ### Improvements
- Evaluation performance improvement specifically for string match
conditions






>Included In This Release
>- 418abad kat-statsig
>   - python use map for string lookup (#288)
>- 17fbdcf kenny-statsig
>   - Override get_id_lists API (#284)
>- 930e34b kat-statsig
>   - log event api override (#283)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.37.0'
+__version__ = '0.38.0'