README: add info about Fedora package
README: add info about Fedora package

Signed-off-by: Tadej Janež <b2f271ecc15772f8b85ee9b0e2ab45d3891873db@nez.si>
Reviewed-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

ToxicFrog/bup,gevaerts/bup,gevaerts/bup,gevaerts/bup,gevaerts/bup,ToxicFrog/bup,gevaerts/bup,ToxicFrog/bup,ToxicFrog/bup,ToxicFrog/bup