Issue 3317: Update badges (#3318)
Issue 3317: Update badges (#3318)

Updates badges in readme file to include license and version.

Signed-off-by: Flavio Junqueira (fpj) <48c356ff4855e878e2050cfad72b47f4633a5eef@emc.com>
pravega/pravega,pravega/pravega,pravega/pravega