Hints for corsix-th in contrib

Warnings

• asv-description-has-plaintext-url
  com.corsixth.CorsixTH.appdata.xml:16 - ul
  The description contains a web URL in plain text. This is not allowed, please use the <url/> tag instead to share links.
• asv-desktop-app-launchable-missing
  com.corsixth.CorsixTH.appdata.xml -
  This `desktop-application` component is missing a `desktop-id` launchable tag. This means that this application can not be launched and has no association with its desktop-entry file. It also means no icon data or category information from the desktop-entry file will be available, which will result in this application being ignored entirely.
• screenshot-download-error
  Error while downloading screenshot from 'http://corsixth.com/wp-content/uploads/2016/04/screenshot9-1024x640.jpg': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'http://corsixth.com/wp-content/uploads/2016/04/screenshot0-1024x640.jpg': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://camo.githubusercontent.com/1b82352e0f0eac03a6927af7e9d7bbad8c380f93/687474703a2f2f692e696d6775722e636f6d2f714856363055692e706e67': Unexpected status code: 403
  This might be a temporary server issue, or the screenshot is no longer available.