[release] 0.50.0 - Memory improvement and reduce noisy error (#375)

### Improvements
  - avoid unnecessary config copies to improve memory usage
  - check status code before throwing seek range error





>Included In This Release
>- 950c98f kat-statsig
>   - Only perform copy when necessary (#374)
>- d9cffe5 kat-statsig
>   - seek range fix (#372)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.49.0'
+__version__ = '0.50.0'