Hints for otpclient in main

Hints

• asv-id-tag-has-type
  com.github.paolostivanin.OTPClient.appdata.xml:4 - com.github.paolostivanin.OTPClient.desktop
  The <id/> tag still contains a `type` property, probably from an old conversion to the recent metainfo format.
• asv-developer-name-tag-deprecated
  com.github.paolostivanin.OTPClient.appdata.xml:62 -
  The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
• asv-developer-info-missing
  com.github.paolostivanin.OTPClient.appdata.xml -
  This component contains no `developer` element with information about its author.