error handling and cleanup

[glaslos]

Go lint cleanup and some improved error handling

[codecov-io]

Codecov Report

Merging #1 into master will increase coverage by 3.75%. The diff coverage is 8.92%.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
+ Coverage    48.1%   51.86%   +3.75%     
==========================================
  Files          10       10              
  Lines         661      698      +37     
==========================================
+ Hits          318      362      +44     
+ Misses        271      248      -23     
- Partials       72       88      +16

Impacted Files	Coverage Δ
time_signature.go	0% <ø> (ø)	:arrow_up:
encoder.go	36.84% <0%> (-2.64%)	:arrow_down:
decoder.go	55.93% <16.66%> (-7.53%)	:arrow_down:
track.go	89.28% <25%> (-3.17%)	:arrow_down:
decoder_event.go	33.15% <25%> (-0.37%)	:arrow_down:
event.go	42.79% <5.12%> (+16.39%)	:arrow_up:
note.go	87.5% <0%> (+25%)	:arrow_up:

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[glaslos]

bump?

[glaslos]

bump?