Update b4 to version 0.11.0 / rev 28 via SR 1043854
    
    https://build.opensuse.org/request/show/1043854
    by user jirislaby + dimstar_suse
    - Update to version 0.11.0:
      * b4 prep --compare-to N: shows a range-diff
      * b4 ty: can be configured to always send mail
      * b4 send will no longer send the entire series to the addresses found
        in individual commit Cc: trailers
      * you can now set extra [PATCH] prefixes permanently
      * b4 has internal changes to ensure that we generate 7-bit-clean
        headers for all outgoing mail
      * b4 send --reflect: prepares the patches but only sends them to
        yourself
      * b4 prep --show-info: shows information about your prep-managed
        branch