Test against Go 1.19 and 1.20

[cinchurge]

Update test spec to test against the two most recent minor releases. Fixed some gofmt changes resulting from the version update.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (c6f8848) 89.18% compared to head (0e0ee08) 89.16%.

❗ Current head 0e0ee08 differs from pull request most recent head d1b638e. Consider uploading reports for the commit d1b638e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #892      +/-   ##
==========================================
- Coverage   89.18%   89.16%   -0.03%     
==========================================
  Files          43       43              
  Lines        4440     4440              
==========================================
- Hits         3960     3959       -1     
- Misses        361      363       +2     
+ Partials      119      118       -1     

Impacted Files	Coverage Δ
introspection.go	95.15% <ø> (ø)

... and 4 files with indirect coverage changes

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[mway]

lgtm