GetBool() method

[mligor]

Hi András,

you made a great work here - anyway I needed reading bool from json and I implemented GetBool() method. I tried to follow your style.

If you want you can merge my changes in your repo

[codecov-io]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #2   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines         270    296   +26     
=====================================
+ Hits          270    296   +26

Impacted Files	Coverage Δ
dyno.go	100% <100%> (ø)	⬆️

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[icza]

My notes:

• Your commit introduces dependencies to encoding/json and strconv packages. These could be avoided. For example my code tests for json.Number by checking if the type implements interface { Float64() (float64, error) } explicitly, to avoid having to refer to the json package.

• GetXX functions that contain the short name of a type return the type without applying built-in conversion, such as GetInt(). When a method uses built-in conversion, to make this obvious, the long name of the type is used (e.g. GetInteger(), GetFloating()). So this GetBool() should not use built-in conversion, the one that uses should be called GetBoolean().

[mligor]

Thanks for the notes. I will try to solve it - I'm in my first week using golang :)
Also code coverage should not decrease.

[icza]

Accepted the PR. Made some subsequent commits to improve docs and consistency within the library.