Make a new patch release version v0.5.4 with latest PR merges.

[dostiharise]

I need a stable release tag to pull for my project that contains the following PR merge:

• Issue No support for environment variables for Lambda Function Definition, under Greengrass Group. #22 and Pull Request Issue #22: Added support for greengrass group lambda environment variables. #23

Can you kindly make a release version v0.5.4 or v0.6.0 accordingly please?

[dostiharise]

@brettf,

Kindly suggest the right person whom I can reach out fo making this release.

Good day!

[brettf]

Sorry - I missed this notification over the past few months of world craziness. I should be able to make a stable release in the next week or so.