Fix lisp code blocks in README.
Fix `prelude-smart-open-line-above`
Merge pull request #330 from seanfisk/fix-lisp-readme

Fix lisp code blocks in README.
Fix keychord mention
Merge pull request #331 from toctan/master

Fix `prelude-smart-open-line-above`
Add new command `prelude-top-join-line`

Saner version of the built-in `join-line`, that joins lines from the top
to the bottom.
Pull in upstream changes