Implement simple stream write priorities

[jared2501]

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 1.65%. The diff coverage is 97.95%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage    85.3%   86.95%   +1.65%     
==========================================
  Files           4        4              
  Lines         381      414      +33     
==========================================
+ Hits          325      360      +35     
+ Misses         48       47       -1     
+ Partials        8        7       -1

Impacted Files	Coverage Δ
stream.go	82% <100%> (+0.75%)	:arrow_up:
session.go	87.78% <97.36%> (+2.73%)	:arrow_up:

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