Hints for calligrasheets in universe

Hints

• asv-url-not-secure
  org.kde.calligrasheets.appdata.xml:199 - http://docs.kde.org/stable/en/calligra/sheets/index.html
  Consider using a secure (HTTPS) URL for this web link.
• asv-url-not-secure
  org.kde.calligrasheets.appdata.xml:197 - http://www.calligra.org/sheets/
  Consider using a secure (HTTPS) URL for this web link.
• asv-screenshot-media-url-not-secure
  org.kde.calligrasheets.appdata.xml:202 - http://kde.org/images/screenshots/sheets.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.