Fix missing dependency to commandline arguments parser

[notbear]

Adds a direct dependency to commandline arguments parser. As the currently used optimist is deprecated, switching to yargs.

Closes #216

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @notbear to sign the Salesforce.com Contributor License Agreement.

[notbear]

is this Pull request ready to be merged?

Yes

[onx2]

When can this be merged?

[notbear]

@aputinski @zahnster Can I ask for merge?

[zahnster]

Sure @notbear, this looks good! Thanks for the ping. I'll merge.

[Norbz]

Hi there,

Thanks for the fix.
Is this possible to have a release for this ? Currently, the latest npm version is broken, and it breaks all the build on our CI. I'd would love not to switch all my projects using theo to a github branch install :)

Thanks !

[LolliDepp]

Yes if you could please make a release - I think with one of the other updates you removed a dependency which was sneaking in optimist aniway, and now it does not work

[StevenLangbroek]

hey @zahnster! it looks like there hasn't been a release since january, is that accurate?

[BirgitPohl]

When does the release come? As I can see, what is in master is not yet in a new stamped version.
I'd like to use Theo preferably, but can't use it now, because of the issue that persists in the previous versions.

[nicohenao]

Hi @zahnster ! Thanks for merging this PR, can I ask you to publish a new release to NPM so we get this change? thanks!

[Norbz]

Please make a new release for this