Support for arbitrary map key types serialisation and deserialisation

[mitchelladam]

currently vavr-gson only supports Maps with java.lang.String keys, this update allows for completely arbitrary key types including complex or nested keys.

[codecov-io]

Codecov Report

Merging #8 (9a8da5b) into master (af6c02c) will decrease coverage by 2.04%.
The diff coverage is 91.22%.

@@              Coverage Diff              @@
##              master       #8      +/-   ##
=============================================
- Coverage     100.00%   97.95%   -2.05%     
- Complexity       101      107       +6     
=============================================
  Files              9        9              
  Lines            209      245      +36     
  Branches           8       12       +4     
=============================================
+ Hits             209      240      +31     
- Misses             0        3       +3     
- Partials           0        2       +2     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/vavr/gson/MultimapConverter.java	88.88% <0.00%> (-11.12%)	6.00 <0.00> (ø)
...c/main/java/io/vavr/gson/TraversableConverter.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
src/main/java/io/vavr/gson/MapTypeConverter.java	84.61% <84.61%> (ø)	10.00 <10.00> (?)
src/main/java/io/vavr/gson/ArrayTypeConverter.java	100.00% <100.00%> (ø)	7.00 <1.00> (?)
src/main/java/io/vavr/gson/MapConverter.java	100.00% <100.00%> (ø)	8.00 <5.00> (+2.00)
src/main/java/io/vavr/gson/OptionConverter.java	100.00% <100.00%> (ø)	9.00 <1.00> (ø)
src/main/java/io/vavr/gson/TupleConverter.java	100.00% <100.00%> (ø)	7.00 <1.00> (ø)
src/main/java/io/vavr/gson/VavrGson.java	100.00% <100.00%> (ø)	50.00 <1.00> (+1.00)

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[mitchelladam]

any chance this might get merged soon?