- Run spec-cleaner
- Drop not needed scriplets

- Update to version 1.6.0
* HTML live preview is now in a split pane view rather than in a
separate window.
* New options were added to hide HUD windows while typing, in full
screen mode, or in live preview mode.
* A new button was added to the status bar and a new shortcut was
added to the View menu in the menu bar to toggle hiding/showing the
open HUDs.
* Github's cmark-gfm can now be detected and used as a Markdown
processor.
* Block quotes and code blocks now have an inobtrusive background
color to differentiate them.
* Buttons have been added to the status for existing features.
* HUD windows and scrollbars can be stylized to have square or
rounded corners in the Settings, and are no longer theme dependent.
* New "Typewriter" focus mode was added by @hirschenberger.
* The style sheet and Markdown processor to use with the HTML live
preview can now be selected in their own dialog box accessible both
from the status bar at the bottom of the window and from the menu bar
in the Settings menu.
* The "Copy HTML" button has been moved to the "status bar" at the
bottom of the main window.
* The "Copy HTML" button / menu bar option can copy just the selected
Markdown text as HTML (using the currently selected Markdown
processor). It will still copy the entire Markdown text document and
convert it to HTML in the system clipboard if no text is selected.
* Themes now support options for emphasis color and block text color.