[release] 0.40.0 - Enforce dependency packages version, get_feature_g…

…ate new option (#299)

### New Features
  - New option to disable get_feature_gate exposure logging
  ### Improvements
- Downgrad grpcio and protobuf package. Enforce dependency packages
versions





>Included In This Release
>- 244ac26 kat-statsig
>   - downgrade packages to support py 3.7 (#298)
>- 26db0d8 kenny-statsig
> - [SDK-489] option to disable exposure logging in get_feature_gate
(#277)
>- 1e15632 kat-statsig
>   - try catch get queue size (#297)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.39.0'
+__version__ = '0.40.0'