Add go-get deprecation note

[LandonTClipp]

Description

Add explicit deprecation note for go-get.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #457 (14e0119) into master (c9dc740) will not change coverage.
The diff coverage is n/a.

❗ Current head 14e0119 differs from pull request most recent head 3d44fca. Consider uploading reports for the commit 3d44fca to get more accurate results

@@           Coverage Diff           @@
##           master     #457   +/-   ##
=======================================
  Coverage   70.99%   70.99%           
=======================================
  Files           7        7           
  Lines        1293     1293           
=======================================
  Hits          918      918           
  Misses        321      321           
  Partials       54       54           

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