Unexport couchdb.BulkGetError type

[flimzy]

Fixes #695

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (2f74f5a) 82.94% compared to head (6955781) 82.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #705   +/-   ##
=======================================
  Coverage   82.94%   82.94%           
=======================================
  Files          85       85           
  Lines        9023     9023           
=======================================
  Hits         7484     7484           
  Misses       1329     1329           
  Partials      210      210           

Files Changed	Coverage Δ
couchdb/bulkget.go	81.81% <100.00%> (ø)

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