Add support for passing strings to Base.run()

[JamesWrigley]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.85%. Comparing base (d1da2de) to head (9d59553).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/channel.jl	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   63.64%   63.85%   +0.21%     
==========================================
  Files          11       11              
  Lines        3012     3013       +1     
==========================================
+ Hits         1917     1924       +7     
+ Misses       1095     1089       -6     

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