Add binary output buffer support

[insolite]

Otherwise raises:

TypeError: a bytes-like object is required, not 'str'

for provided existing byte buffers.

[codecov[bot]]

Codecov Report

Merging #139 (ccffdb8) into develop (326391b) will decrease coverage by 1.48%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #139      +/-   ##
===========================================
- Coverage    93.43%   91.94%   -1.49%     
===========================================
  Files            8        8              
  Lines         1538     1540       +2     
  Branches       272      273       +1     
===========================================
- Hits          1437     1416      -21     
- Misses          54       77      +23     
  Partials        47       47              

Impacted Files	Coverage Δ
src/snps/utils.py	89.87% <100.00%> (+0.26%)	:arrow_up:
src/snps/ensembl.py	31.70% <0.00%> (-39.03%)	:arrow_down:
src/snps/snps.py	94.70% <0.00%> (-1.10%)	:arrow_down:
src/snps/resources.py	93.79% <0.00%> (-0.37%)	:arrow_down:

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[apriha]

Note that this requires Python 3.7.1+ (see #140).

[apriha]

Thanks @insolite !