updated issue template

[StrikerRUS]

Checklist

• [ ] All new jobs, commands, executors, parameters have descriptions
• [ ] Examples have been added for any significant new features
• [ ] README has been updated, if necessary

Motivation, issues

Fix GitHub deprecation warning:

Refer to the https://github.com/CircleCI-Public/artifactory-orb/pull/17#issuecomment-537965446.

Description

Happy Orbtoberfest!

[gep13]

@StrikerRUS thank you for taking care of this. I just went to do this just now, but then I noticed that you had already taken care of it 😄

[StrikerRUS]

@gep13 Huh, thank you very much for spotting this issue in other repos!