waitall fix write on closed channel

[haitch]

fix a bug where we publish to a closed channel, by not close the channel.

• rely on go garbage collection to cleanup it.
• this has assumption that user task eventually finish.

[codecov-commenter]

Codecov Report

Merging #26 (f3f5e24) into master (33f06ef) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   96.40%   96.34%   -0.07%     
==========================================
  Files           5        5              
  Lines         167      164       -3     
==========================================
- Hits          161      158       -3     
  Misses          4        4              
  Partials        2        2              

Impacted Files	Coverage Δ
wait_all.go	91.66% <ø> (-0.65%)	⬇️
task.go	100.00% <100.00%> (ø)

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[biefy]

r+ biefy