bpo-30824: Add .json mimetype

[e4r7hbug]

The .json extension should have a recognized mimetype as registered by the IANA.

See discussion: https://mail.python.org/pipermail/python-ideas/2017-August/046666.html

https://bugs.python.org/issue30824

[the-knights-who-say-ni]

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[brettcannon]

Sorry about all the redundant approvals, @e4r7hbug , but your PR was simple enough that I could make sure the PR wasn't wasted by me approving it and I needed to test something (the new "awaiting merge" label 😄 ).

[sijis]

Is backporting done automatically or is a new PR necessary?

[brettcannon]

New PRs are necessary. Not sure if @bitdancer was planning to do that still, although if you want to do it, @sijis, I'm sure he wouldn't mind the help. 😄

[sijis]

Yeah, I'd love to try.

[brettcannon]

@sijis then go for it! Have a look at https://github.com/python/core-workflow/tree/master/cherry_picker as that's what we use to create backport PRs (there will also be details in the devguide). The key thing, though, is getting the title formatted properly as we have webhooks in GitHub to connect the backport PRs back to this PR and remove the "backport" labels automatically.

[miss-islington]

🐍🍒⛏🤖 Thanks @e4r7hbug for the PR, and @bitdancer for merging it 🌮🎉.I'm working now to backport this PR to: 2.7, 3.6.

[bedevere-bot]

GH-3394 is a backport of this pull request to the 2.7 branch.

[miss-islington]

🐍🍒⛏🤖 Thanks @e4r7hbug for the PR, and @bitdancer for merging it 🌮🎉.I'm working now to backport this PR to: 3.6.

[bedevere-bot]

GH-3401 is a backport of this pull request to the 3.6 branch.