Added support map queryresult groupby

[fmachado]

Updated README.md and CHANGELOG.md.
#343

[fmachado]

--

@fmachado would you mind adding a Changelog entry and extended documentation ?

btw: thanks for this.
-- #345

No prob! Could you please check if the documentation is clear and what you expected?

[codecov-io]

Codecov Report

Merging #346 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #346   +/-   ##
=========================================
  Coverage     83.44%   83.44%           
  Complexity      199      199           
=========================================
  Files            16       16           
  Lines           906      906           
  Branches         91       91           
=========================================
  Hits            756      756           
  Misses          107      107           
  Partials         43       43

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