Fix space in URL breaking OS X badge
Fix space in URL breaking OS X badge

Was keeping an eye on `badges.herokuapp.com` and noticed a broken badge here.

An unencoded space in `OS X` was causing the webserver to reply with `HTTP/1.1 505 HTTP Version Not Supported`, making the badge a broken image. (Entering this URL in a browser would automatically fix the space so it's hard to notice, but other clients are stricter.)
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