remove swift:4.2

[dgrove-oss]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.93%. Comparing base (cf36299) to head (231ffba).
⚠️ Report is 178 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5160       +/-   ##
===========================================
+ Coverage   45.68%   74.93%   +29.24%     
===========================================
  Files         234      234               
  Lines       13382    13382               
  Branches      541      541               
===========================================
+ Hits         6114    10028     +3914     
+ Misses       7268     3354     -3914     

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