security/tor: 0.3.0.6 -> 0.3.0.7

• medium-severity security bug in earlier versions of 0.3.0.x, where an attacker could cause a Tor relay process to exit

PR: 219246
Relnotes: https://gitweb.torproject.org/tor.git/plain/ReleaseNotes?id=tor-0.3.0.7
Security: TROVE-2017-002
Submitted by: Yuri Victorovich <yuri@rawbw.com> (maintainer)
MFH: 2017Q2