Swap Selections package
Add `sublime_text` version for Swap Selections

Add missing version identifier for ST. Required by continuous
integration tests.continuous
Remove old SwapSelection package from channels.json

As suggested by @FichteFoll:

@ both, if gillibrand's package provides the same functionality as
chenha0 but also works for ST3, it is superior to it. It only has 37
installs according to the stats, but imo you should replace the package
with your version because it is still being maintained. In order to to
that, you should remove his entry in channel.json and then you can
either let your package have the same name or add a previous_names key
that includes the old one.
Merge pull request #2515 from gillibrand/master

Swap Selections package