Add Probot as a curated topic

[tcbyrd]

• I followed the contributing guidelines: https://github.com/github/explore/blob/master/CONTRIBUTING.md

I am:

• Suggesting edits to an existing Topic page
• Curating a new Topic page

CURATING A NEW TOPIC PAGE

• I've formatted my changes as a new folder directory, named for the topic as it appears in the URL on GitHub (e.g. https://github.com/topics/[NAME])
• My folder contains a *.png image (if applicable) and index.md
• All required fields in my index.md conform to the Style Guide and API docs: https://github.com/github/explore/tree/master/docs

Please explain why you think this Topic page should be curated:

Probot is an extension of GitHub Apps, created and maintained by both Hubbers and the larger GitHub community. As more Apps are created, we want to ensure users can easily find Probot Apps and related extensions using topics.

cc @bkeepers in case you'd like to add/edit anything. I used March 2017 for the release based on the first release (0.2.0).

Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

[cheshire137]

Thanks Tommy! 😀

[cheshire137]

Could you add a period?

[cheshire137]

You could add a related list including github-apps and bot, if you wanted.

[tcbyrd]

@cheshire137 Thanks for the review! I wasn't sure how much the machines would glean automatically! 🤖 LMK if you have any other tips to make this awesome. 💪

[cheshire137]

How about changing the short_description so it mentions Probot itself, not just the end result from using Probot? Maybe "Probot lets you create GitHub Apps to automate and improve your workflow."

[tcbyrd]

Done!

[cheshire137]

Thanks!