[WIP] fix: propagate trailer errors correctly

[dryajov]

fixes - #607

needs tests

[daviddias]

@dryajov can you add a test?

@pgte mind reviewing this one?

[pgte]

other than needing tests, LGTM.

[daviddias]

@richardschneider Windows tests seem to be inconsistent (failing again), mind taking a look? It is not due to this PR but since Appveyor was gracious enough to let this PR do a run, we should take advantage and look at what it says.

[dryajov]

@daviddias, yep working on tests right now.

[richardschneider]

It looks like the .refs test is failing because of CRLFs; see ipfs/js-ipfs-repo#153 (comment).

[codecov]

Codecov Report

Merging #636 into master will increase coverage by 0.15%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #636      +/-   ##
==========================================
+ Coverage    84.1%   84.25%   +0.15%     
==========================================
  Files         115      115              
  Lines        1749     1747       -2     
==========================================
+ Hits         1471     1472       +1     
+ Misses        278      275       -3

Impacted Files	Coverage Δ
src/utils/send-request.js	89.13% <0%> (+2.81%)	⬆️
src/utils/send-files-stream.js	88.75% <100%> (+0.14%)	⬆️

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[richardschneider]

@diasdavid I'm still getting .refs test failure on windows. Do you want to open a new issue/pr?