Update Slack invite link and meetups link

[rupakg]

What did you implement:

Update Slack invite link and meetups link

How did you implement it:

How can we verify it:

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: NO
Is it a breaking change?: NO

[brianneisler]

LGTM

[codecov]

Codecov Report

Merging #462 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #462   +/-   ##
=======================================
  Coverage   68.22%   68.22%           
=======================================
  Files          34       34           
  Lines        2112     2112           
=======================================
  Hits         1441     1441           
  Misses        611      611           
  Partials       60       60

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