Remove dependency to Humanizer

[mr-grant]

Hi!

In the file TrxCommand.cs there is a dependency to Humanizer, the following rows:

This causes some unexpected exceptions if TRX is run on host where culture is different to EN-GB.
The exception looks like: The resource object with key 'TimeSpanHumanize_MultipleSeconds' was not found (Parameter 'resourceKey').
Probably Humanizer doesn't have all the required transaltions for a culture.
Similar issue (for milliseconds) already exist in Humanizer: Humanizr/Humanizer#1503

So, maybe it will be better to remove the dependency and just display timespan as is or another option might be to pass EN-GB culture to Humanize method, anyway the other parts of the message in English.

Thanks!