improve gtest usage message

If you want to use the g1-Test blockchain. You have to add the --gtest at the end of commandline.

The help message is not clear enough about that.

changed milestone to %0.6.0

added CLI enhancement labels

assigned to @cebash

I suggest:

• To use Ğ1-Test currency, you have to add --gtest option at the end of the command. It will request https://g1-test.duniter.org endpoint.

Yep, that's fine!

mentioned in merge request !84 (merged)

added Doing label

closed

mentioned in commit be8154c0

mentioned in commit bf1c30ed

removed Doing label