[Fix] Ensure reek doesn't output line-numbers, '~> 1.3' broken

Per https://github.com/troessner/reek/pull/191/ Reek 1.3.4 now defaults to
outputing line numbers.  While this is a good thing, the same switch
in 1.3.3 than enabled line numbers is now the switch in 1.3.4 that
supresses them.

Therefore, this bumps the lowest reek version to 1.3.4 and sets the
--line-number option to disable line numbers, until we better parse the
output (and don't need our own LineNumber parser)
Fix reek config spec
Merge pull request #166 from metricfu/ensure_expected_reek_output

[Fix] Ensure reek doesn't output line-numbers, '~> 1.3' broken