v0.3.1

• Generate debian/gitlab-ci.yml too.
• Add remote "origin" to point to Salsa in .git/config
  to save the user from doing so manually.
• Preconfigure git branches just as "git clone" and "gbp clone" would do.
• List full path of /usr/sbin/sendmail in final instructions
  so that the end developer can copy-and-paste to send ITP mail
  without using sudo.
• Fix empty host var before slicing.
  Fixes #120 "slice bounds out of range" error with -allow_unknown_hoster.
  Thanks @utkarsh2102 and @montj2!
• Sort dependency list like wrap-and-sort,
  i.e. place variables like ${misc:Depends} and ${shlibs:Depends}
  at the end of the list. Fixes #121. Thanks @elboulangero!