Map love

[passsy]

Add extensions to Map, similar to what we have for List

[codecov]

Codecov Report

Merging #136 (3c0afc7) into master (4c1ec46) will increase coverage by 0.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   96.26%   96.72%   +0.46%     
==========================================
  Files          10       11       +1     
  Lines         669      763      +94     
==========================================
+ Hits          644      738      +94     
  Misses         25       25              

Impacted Files	Coverage Δ
lib/src/map.dart	100.00% <100.00%> (ø)

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