Update omniauth dependency version

[carlosmartinez]

Resolve issue whereby omniauth gem is restricted to v1.x (as per issue 31)

[hasghari]

Would be great to get this merged and released.

[roykolak]

Bump on this!

[iloveitaly]

@realdoug would be great to get this merged! Happy to help with maintenance here if that would help.

[cavi21]

Hi here! is there any update on this PR? @realdoug have you being able to look into it? if not anyone has an alternative? maybe this fork seems that it's being maintained, any comment is welcome :)!

[stanhu]

@realdoug Would you consider transferring this project to the OmniAuth group (https://github.com/omniauth/), and giving some members privileges to push to RubyGems?

[douglascayers]

@diasluan published a new gem to update the dependencies: https://rubygems.org/gems/omniauth-salesforce-ruby

[stevenharman]

@diasluan it looks like the repo for the code published doesn't actually exist. Is that right? We're looking to switch to a maintained fork, but all options seem to either not publish a Gem, or the source Repo isn't available.

[matteeyah]

Hey, I forked this repo and created a different gem where I updated the dependencies so you can use OmniAuth v2. We use it at my company so we'll support it as long as we're using it - https://github.com/matteeyah/omniauth-salesforce