fix for issue #40

[ajslone]

I think this is a sufficient change for issue #40, but please have a look.

[codecov]

Codecov Report

Merging #41 into master will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
- Coverage   49.47%   49.44%   -0.04%     
==========================================
  Files          28       28              
  Lines        2872     2872              
==========================================
- Hits         1421     1420       -1     
- Misses       1451     1452       +1     

Impacted Files	Coverage Δ
caliban/config/__init__.py	71.92% <100.00%> (ø)
caliban/platform/gke/util.py	70.76% <0.00%> (-0.39%)	⬇️

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[eschnett]

Thanks!

[sritchie]

Yes! Sorry to you both, I thought I had the default handling down a little better. I had a nice clean fix in #39 - now that @eschnett is working on his PR (thank you!!!) I need to keep the house in better order :)