Define is(read|writ)able for BufferStream.

[fredrikekre]

No description provided.

[fredrikekre]

CI on travis was stalled so switched to GH actions but that doesn't run since this PR is from a branch

[codecov]

Codecov Report

Merging #6 (5a5ed82) into master (e592419) will increase coverage by 1.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   95.55%   96.73%   +1.18%     
==========================================
  Files           2        2              
  Lines          90       92       +2     
==========================================
+ Hits           86       89       +3     
+ Misses          4        3       -1     

Impacted Files	Coverage Δ
src/BufferStream.jl	96.70% <100.00%> (+1.19%)	⬆️

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[fingolfin]

This seems plausible to me, but of course the CI tests are still useless right now...