package/ushare: bump to release 2.0

package/ushare: bump to release 2.0

As suggested by Yann E. Morin, switch to an active fork with all our
patches as upstream seems pretty dead, and they even acknowledge that
status:

    https://ushare.geexbox.org/

    By lack of spare time, motivation and interest, uShare development
    is currently discontinued (this may change though). Don't expect
    release anytime soon :-(

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>