Add ContinuumArrays.jl to downstream tests

[dlfivefifty]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.04%. Comparing base (a4a0b93) to head (d7843a9).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #481      +/-   ##
==========================================
+ Coverage   93.81%   94.04%   +0.23%     
==========================================
  Files          19       19              
  Lines        1761     1763       +2     
==========================================
+ Hits         1652     1658       +6     
+ Misses        109      105       -4     

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