o Minor bugfixes (networking):
    - Tor will not reject IPv6 address strings from TorBrowser when they
      are passed as hostnames in SOCKS5 requests. Fixes bug 25036,
      bugfix on Tor 0.3.1.2.
    - string_is_valid_hostname() will not consider IP strings to be valid
      hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.