Feature/python 3 8

[bryantbiggs]

Note: Please remember to review the contribution guidelines
if you have not yet done so.

What does this PR do?

• Adds support for Python 3.8 runtime
• Updates dependencies to latest versions

Motivation

• AWS has recently released the lambda native Python 3.8 runtime

Testing Guidelines

./scripts/run_tests.sh

Additional Notes

All tests have passed, included the dependency updates since they would go out with the next layer publish and low risk of breaking changes.

Closes #31

[DarcyRaynerDD]

Hey @bryantbiggs 👋 . Thanks for the PR, we were just about to get to this, so you've saved us some work. We're going to do some quick internal testing on this, but after that should be good to merge.

[bryantbiggs]

Thanks @DarcyRaynerDD - I have some lambdas written in 3.8 and I used this to package my own layer until the official is released. So far everything appears to be working ok, looking forward to the release