Update Slack invite link

[wbarnha]

Closes #424.

[codecov-commenter]

Codecov Report

Base: 93.88% // Head: 93.88% // No change to project coverage 👍

Coverage data is based on head (d79eff8) compared to base (337cd30).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #425   +/-   ##
=======================================
  Coverage   93.88%   93.88%           
=======================================
  Files         102      102           
  Lines       11085    11085           
  Branches     1516     1516           
=======================================
  Hits        10407    10407           
  Misses        595      595           
  Partials       83       83           

Impacted Files	Coverage Δ
faust/models/record.py	96.38% <100.00%> (ø)

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