Bug#858637: Downgrade dependency on python3-tk

[Yuri D'Elia]

Package: python3-seaborn
Version: 0.7.1-3
Severity: normal

seaborn 0.7.1-3 now depends on tk, but it's not directly required for seaborn.
It's only used when the tkagg backend is selected in matplotlib.
For other backends, tk is not required.

Please downgrade the dependency to a Recommends.


-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (900, 'unstable'), (800, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages python3-seaborn depends on:
ii  python3-matplotlib  2.0.0+dfsg1-2
ii  python3-numpy       1:1.12.0-2
ii  python3-pandas      0.19.2-5
ii  python3-scipy       0.18.1-2
pn  python3:any         <none>

Versions of packages python3-seaborn recommends:
pn  python3-bs4    <none>
ii  python3-patsy  0.4.1+git34-ga5b54c2-1

python3-seaborn suggests no packages.