This month's release was just tagged. Here's what changed:
* Modifies the way atomic ranges are skipped by selection to try and
make it less surprising.
* The Swift mode was rewritten.
* New addon: jump-to-line.
* New method: isReadOnly.
* The show-hint addon now defaults to picking completions on single click.
* The object passed to "beforeSelectionChange" events now has an
originproperty.
* New mode: Crystal.
You can see all new patches here:
https://github.com/codemirror/CodeMirror/compare/5.9.0...5.10.0
And get the zip from here:
http://codemirror.net/codemirror-5.10.zip
Best,
Marijn