nvim: support nvim v0.6.0 APIs

[zchee]

Support nvim v0.6.0 APIs.

[codecov]

Codecov Report

Merging #125 (baa03c6) into master (34b6240) will increase coverage by 0.5%.
The diff coverage is 90.1%.

@@           Coverage Diff            @@
##           master    #125     +/-   ##
========================================
+ Coverage    80.0%   80.5%   +0.5%     
========================================
  Files          14      14             
  Lines        2992    3018     +26     
========================================
+ Hits         2394    2430     +36     
+ Misses        598     588     -10     

Flag	Coverage Δ
linux-1.15-nightly	80.5% <90.1%> (+0.5%)	⬆️
linux-1.15-stable	80.5% <90.1%> (+0.5%)	⬆️
linux-1.16-nightly	80.5% <90.1%> (+0.5%)	⬆️
linux-1.16-stable	80.5% <90.1%> (+0.5%)	⬆️
linux-1.17-nightly	80.5% <90.1%> (+0.5%)	⬆️
linux-1.17-stable	80.5% <90.1%> (+0.5%)	⬆️
macos-1.15-nightly	80.5% <90.1%> (+0.5%)	⬆️
macos-1.15-stable	80.5% <90.1%> (+0.5%)	⬆️
macos-1.16-nightly	80.5% <90.1%> (+0.5%)	⬆️
macos-1.16-stable	80.5% <90.1%> (+0.5%)	⬆️
macos-1.17-nightly	80.5% <90.1%> (+0.5%)	⬆️
macos-1.17-stable	80.5% <90.1%> (+0.5%)	⬆️
windows-1.15-nightly	79.6% <90.1%> (+0.5%)	⬆️
windows-1.15-stable	79.6% <90.1%> (+0.5%)	⬆️
windows-1.16-nightly	79.6% <90.1%> (+0.5%)	⬆️
windows-1.16-stable	79.6% <90.1%> (+0.5%)	⬆️
windows-1.17-nightly	79.6% <90.1%> (+0.5%)	⬆️
windows-1.17-stable	79.6% <90.1%> (+0.5%)	⬆️

Impacted Files	Coverage Δ
nvim/nvim.go	79.7% <16.6%> (+2.0%)	⬆️
nvim/api.go	96.8% <100.0%> (+0.1%)	⬆️
nvim/types.go	87.5% <100.0%> (ø)
msgpack/decode.go	83.1% <0.0%> (+0.6%)	⬆️

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