Hints for lifeograph in main

Hints

• asv-description-first-word-not-capitalized
  net.sourceforge.Lifeograph.metainfo.xml:312 -
  The description line does not start with a capitalized word, project name or number.
• asv-nonstandard-gnome-extension
  net.sourceforge.Lifeograph.metainfo.xml:328 - kudos
  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.