v1.5.0

This release adds a shortcut cmd/ctrl+shift+E for automatically wrapping selected text in a code block.

This also fixes a bug with capitalisation of hotkeys implying shift. On MacOS the cmd+shift plane specifically lower-cases letters, meaning event.key is set to lower case if metaKey and shiftKey are true; the same is not true for ctrl, or for other OSes. This fixes the bug so that the presence of shiftKey will capitalise event.key, for the hotkey attribute.