o Major bugfixes (hidden service, relay, security):
    - Fix an assertion failure when a hidden service handles a
      malformed BEGIN cell. This bug resulted in the service crashing
      triggered by a tor_assert(). Fixes bug 22493, tracked as
      TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
      Found by armadev.