Added Decode/Encode for HashMap<K, V>

[VictorKoenders]

No description provided.

[codecov-commenter]

Codecov Report

Merging #438 (197b19f) into trunk (a7c8964) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            trunk     #438      +/-   ##
==========================================
+ Coverage   61.52%   61.74%   +0.21%     
==========================================
  Files          46       46              
  Lines        3319     3338      +19     
==========================================
+ Hits         2042     2061      +19     
  Misses       1277     1277              

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/features/impl_std.rs	75.52% <100.00%> (+2.65%)	⬆️
tests/std.rs	100.00% <100.00%> (ø)

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