Prefer https for github and twitter

[adrianmoisey]

This is a little nitpicky, but both GitHub and Twitter are served on https.
Linking to the http version causes a redirect.

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This change is 

[bridgetkromhout]

Fixes #595

[mattstratton]

Damn. I would have thought I would have caught this :)

[adrianmoisey]

😀

[mattstratton]

@adrianmoisey in the future, can you add closing keywords to your initial PR comment? That way when we merge the PR the issue connected gets closed (like see how Bridget did it?)

[adrianmoisey]

Sure, no worries.
I did make the PR before the issue was created.
Do you require issues be created before they are solved?

[mattstratton]

Do you require issues be created before they are solved?

Nope! But you can edit the description of the PR. Basically, I just noticed that it didn't auto-close when we merged it, and I see that it was because @bridgetkromhout put the closing keywords in a later comment, which I think she thought would auto-close it.

On the theme, we like there to be a matching issue because the changelog is driven by closed issues, not by closed PRs :)