nvim: Update documentation and small optimize

[zchee]

Update documentation and small optimize.

[codecov]

Codecov Report

Merging #108 (6785b73) into master (7420c31) will decrease coverage by 0.1%.
The diff coverage is 66.6%.

@@           Coverage Diff            @@
##           master    #108     +/-   ##
========================================
- Coverage    63.4%   63.2%   -0.2%     
========================================
  Files          14      14             
  Lines        2085    2085             
========================================
- Hits         1323    1319      -4     
- Misses        625     631      +6     
+ Partials      137     135      -2     

Flag	Coverage Δ
linux-1.14	63.2% <66.6%> (-0.2%)	⬇️
linux-1.15	63.2% <66.6%> (-0.2%)	⬇️
linux-1.16	63.2% <66.6%> (-0.1%)	⬇️
macos-1.14	63.2% <66.6%> (-0.2%)	⬇️
macos-1.15	63.2% <66.6%> (-0.1%)	⬇️
macos-1.16	63.2% <66.6%> (-0.2%)	⬇️
windows-1.14	62.4% <66.6%> (-0.2%)	⬇️
windows-1.15	62.4% <66.6%> (?)
windows-1.16	62.4% <66.6%> (-0.1%)	⬇️

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Impacted Files	Coverage Δ
nvim/api.go	38.6% <ø> (ø)
nvim/helpers.go	82.6% <ø> (ø)
nvim/types.go	0.0% <ø> (ø)
nvim/nvim.go	70.4% <66.6%> (ø)
msgpack/decode.go	74.2% <0.0%> (-1.8%)	⬇️
msgpack/unpack.go	92.2% <0.0%> (+1.5%)	⬆️

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