Implement easy collection unstructuring

[Tinche]

No description provided.

[codecov]

Codecov Report

Merging #137 (0c2cc1b) into master (4f05fad) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   97.97%   98.07%   +0.10%     
==========================================
  Files           6        6              
  Lines         542      571      +29     
==========================================
+ Hits          531      560      +29     
  Misses         11       11              

Impacted Files	Coverage Δ
src/cattr/_compat.py	97.59% <100.00%> (+0.25%)	⬆️
src/cattr/converters.py	99.19% <100.00%> (+0.07%)	⬆️

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