update to 0.10.1
    
    Per the upstream release announcement¹:
    
        B4 version 0.10.1 is now available. This release contains the
        following changes compared to 0.10.0 (among other minor
        improvements):
    
        - Fixes the crash with "b4 ty" when using a local binary to send
          mail, and generally improves the [sendemail] configuration section
          compatibility
        - The "send" and "prep" commands now properly include diffstats into
          generated patches
        - Does not force single-patch series to have a cover letter. The
          contents of the cover letter are now appended to the basement
          section of the patch.
        - Does not force "v1" to be added to the prefixes
    
    ¹ https://lore.kernel.org/tools/20220926172903.f3mudqmts5woudll@meerkat.local/