Bug#810866: gedit-plugins: not installable due to Depends: python3 (< 3.5)

[Vincent Lefevre]

Package: gedit-plugins
Version: 3.18.0-1
Severity: grave
Justification: renders package unusable

gedit-plugins is not installable:

# apt-get install gedit-plugins
[...]
The following packages have unmet dependencies:
 gedit-plugins : Depends: python3 (< 3.5) but 3.5.1-1 is to be installed
E: Unable to correct problems, you have held broken packages.

I thought that this was due to the python3.5 transition, but it is not
listed on: https://release.debian.org/transitions/html/python3.5.html

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.3.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)