message: Update NEWS for v3.0
diff: +Version 3.0
  +-----------
  +
  +- [macOS] Full support for macOS 11 Big Sur and Apple Silicon (M1).
  +- Completely reworked welcome screen.
  +- Modernized user inteface and icons.
  +- Much improved opening of recently edited files.
  +- Automatic reloading of files modified outside of Poedit.
  +- Completely new source code occurrences viewers with syntax highlighting for
  + virtually all programming languages used with gettext.
  +- Editing area now indicates source and translation string lengths.
  +- Full python-format support for PO files.
  +- Further improvements to XLIFF handling.
  +
  +
  Version 2.4.3
  -------------
  