Tests failed randomly on Travis CI, but tests on local are fine, see [build 1](https://travis-ci.org/bosnet/isaac-consensus-protocol/builds/364040378), [build 2](https://travis-ci.org/bosnet/isaac-consensus-protocol/builds/365520465). It can be timing issue because of CI server performance. Anyway, we should find the problem.
Tests failed randomly on Travis CI, but tests on local are fine, see build 1, build 2.
It can be timing issue because of CI server performance. Anyway, we should find the problem.