Hints for hamster-time-tracker in main

Warnings

• asv-tag-duplicated
  org.gnome.Hamster.GUI.metainfo.xml:47 - provides
  This tag must only appear once in this context. Having multiple tags of this kind is not valid.
• screenshot-save-error
  Unable to store screenshot for 'https://github.com/projecthamster/hamster/blob/master/screenshot.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format
• screenshot-save-error
  Unable to store screenshot for 'https://github.com/projecthamster/hamster/blob/master/data/screenshots/overview2.png': Can not store source screenshot: Failed to load image data: Unrecognized image file format