(hotfix) require 'timeout' for access to `Timeout::Error`
(hotfix) require 'timeout' for access to `Timeout::Error`

Something changed from 2.3.4 to 2.3.5 so that this class isn't
auto required/available.  This switches to requiring it so that
the test suite passes.

I'm currently testing against 2.3.7.  This is part of making sure
our gems are all working on modern ruby versions.

redding/deas,redding/deas