nvim: implements Notify, OpenTerm and HideWindow following neovim/neovim@b274b98

[zchee]

Implements Notify, OpenTerm and HideWindow following neovim/neovim@b274b9887aba.

Close: #110

[codecov]

Codecov Report

Merging #113 (291a8c8) into master (2542aa1) will increase coverage by 0.6%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #113     +/-   ##
========================================
+ Coverage    63.2%   63.9%   +0.6%     
========================================
  Files          14      14             
  Lines        2085    2114     +29     
========================================
+ Hits         1319    1352     +33     
+ Misses        631     626      -5     
- Partials      135     136      +1     

Flag	Coverage Δ
linux-1.14	63.9% <100.0%> (+0.6%)	⬆️
linux-1.15	63.8% <100.0%> (+0.5%)	⬆️
linux-1.16	63.8% <100.0%> (+0.5%)	⬆️
macos-1.14	63.9% <100.0%> (+0.6%)	⬆️
macos-1.15	63.8% <100.0%> (+0.5%)	⬆️
macos-1.16	63.9% <100.0%> (+0.7%)	⬆️
windows-1.14	63.1% <100.0%> (+0.7%)	⬆️
windows-1.15	63.1% <100.0%> (+0.6%)	⬆️
windows-1.16	63.1% <100.0%> (+0.7%)	⬆️

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Impacted Files	Coverage Δ
nvim/api.go	40.2% <100.0%> (+1.5%)	⬆️
nvim/nvim.go	72.1% <100.0%> (+1.6%)	⬆️
nvim/types.go	92.8% <100.0%> (+92.8%)	⬆️

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