nvim: add Buffer event types

[zchee]

Add Buffer event types

[codecov]

Codecov Report

Merging #106 (9aa93e7) into master (a45dcbd) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #106   +/-   ##
======================================
  Coverage    63.3%   63.4%           
======================================
  Files          14      14           
  Lines        2085    2085           
======================================
+ Hits         1321    1323    +2     
+ Misses        627     625    -2     
  Partials      137     137           

Flag	Coverage Δ
linux-1.14	63.4% <ø> (+<0.1%)	⬆️
linux-1.15	63.4% <ø> (+<0.1%)	⬆️
linux-1.16	63.4% <ø> (+<0.1%)	⬆️
macos-1.14	63.3% <ø> (ø)
macos-1.15	63.4% <ø> (+<0.1%)	⬆️
macos-1.16	63.4% <ø> (+<0.1%)	⬆️
windows-1.14	62.6% <ø> (+<0.1%)	⬆️
windows-1.15	62.6% <ø> (+<0.1%)	⬆️
windows-1.16	62.6% <ø> (+<0.1%)	⬆️

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Impacted Files	Coverage Δ
nvim/types.go	0.0% <ø> (ø)
nvim/api.go	38.6% <0.0%> (+0.5%)	⬆️

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