Hints for shipments in testing

Hints

• asv-screenshot-media-url-not-secure
  org.postmarketos.Shipments.appdata.xml:28 - http://brixitcdn.net/metainfo/shipments.png
  Consider using a secure (HTTPS) URL to reference this screenshot image or video.
• asv-description-first-para-too-short
  org.postmarketos.Shipments.appdata.xml:10 - Application to track your shipments. Supported carriers:
  The first `description/p` paragraph of this component might be too short (< 80 characters). Please consider starting with a longer paragraph to improve how the description looks like in software centers and to provide more detailed information on this component immediately in the first paragraph.