update golang/protobuf pkg to 1.3.0

[danilvpetrov]

Fixes #154.

[codecov-io]

Codecov Report

Merging #155 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   28.26%   28.26%           
=======================================
  Files          78       78           
  Lines        3064     3064           
=======================================
  Hits          866      866           
  Misses       2174     2174           
  Partials       24       24

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