Allow :/ in remote URL

[tjbenator]

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Description of the Change

Changed regex to allow for :/ in the remote URL:
git@github.com:/atom/github.git
ssh://git@github.com:/atom/github.git

This may fix issues some have had in #1010

Screenshot/Gif

N/A

Alternate Designs

N/A

Benefits

This will allow the following remote URLs and enable login to github:
git@github.com:/atom/github.git
ssh://git@github.com:/atom/github.git

Possible Drawbacks

I can't think of any

Applicable Issues

Metrics

N/A

Tests

I added the additional URLs to the models/remote.test.js. No new tests needed. I also verified the remote URL worked in git with a git pull

Documentation

N/A

Release Notes

Allows :/ in ssh/git URLs

User Experience Research (Optional)

[annthurium]

thanks for taking a stab at this, @tjbenator !

looks good to me.

We have a team policy that community pull requests should be reviewed by 2 core team members, so I'll wait for a second approval before merging.

[smashwilson]

👍 Looks good to me. And thanks for adding tests 😄