Update NEWS.md with changes since release of v2.0.1.
Update NEWS.md with changes since release of v2.0.1.

librsync/librsync,dbaarda/librsync,sourcefrog/librsync,sourcefrog/librsync,librsync/librsync,dbaarda/librsync,librsync/librsync,dbaarda/librsync,librsync/librsync,sourcefrog/librsync,dbaarda/librsync,sourcefrog/librsync