Hints for nicotine in main

Hints

• asv-description-first-para-too-short
  <code>org.nicotine_plus.Nicotine.appdata.xml:26</code> - <em>Nicotine+ is a graphical client for the Soulseek peer-to-peer network.</em><br/>The first `description/p` paragraph of this component might be too short (&lt; 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.
• asv-nonstandard-gnome-extension
  <code>org.nicotine_plus.Nicotine.appdata.xml:272</code> - <em>kudos</em><br/>This tag is a GNOME-specific extension to AppStream and not part of the official specification. Do not expect it to work in all implementations and in all software centers.
• asv-developer-name-tag-deprecated
  <code>org.nicotine_plus.Nicotine.appdata.xml:281</code> - <em></em><br/>The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.