pretty output for non-standard dicts

[samuelcolvin]

fix #48

Also support asyncpg record results.

[codecov]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #60   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          385       367   -18     
  Branches        58        57    -1     
=========================================
- Hits           385       367   -18     

Impacted Files	Coverage Δ
devtools/utils.py	100.00% <100.00%> (ø)

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