Fixed broken Slack invite link

[hummelstrand]

Updated the broken link to the Sofie Slack channel.

About the Contributor

Part of the Sofie team at SuperFly.tv

Type of Contribution

This is a:
Documentation improvement

Current Behavior

Broken Slack invite link.

New Behavior

Working Slack invite link.

Testing

• I have added one or more unit tests for this PR
• I have updated the relevant unit tests
• No unit test changes are needed for this PR

Affected areas

Documentation

Time Frame

ASAP

Other Information

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.03%. Comparing base (00c01bb) to head (73c73d6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1333      +/-   ##
==========================================
+ Coverage   57.99%   58.03%   +0.04%     
==========================================
  Files         525      525              
  Lines       85094    85094              
  Branches     4447     4459      +12     
==========================================
+ Hits        49352    49388      +36     
+ Misses      35716    35651      -65     
- Partials       26       55      +29     

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