MR14: Update "Maintained" to 2019 for DockerHub README

[sagetrac-gitlab-bot]

Julian Rüth (@saraedum) opened a merge request at https://gitlab.com/sagemath/sage/merge_requests/14:

This updates the "maintained" year for the README on Docker Hub,
thus making it clear this project is currently maintained.

CC: @slel

Component: distribution

Keywords: days101

Author: Samuel Lelièvre

Branch/Commit: 96a0c45

Reviewer: Julian Rüth

Issue created by migration from https://trac.sagemath.org/ticket/28010

[slel]

Changed branch from u/galois/mrs/14/update-maintained-2019 to u/slelievre/mrs/14/update-maintained-2019

[saraedum]

New commits:

96a0c45

#28010 Signal Sage Docker as maintained in 2019

[saraedum]

Changed author from Julian Rüth to Samuel Lelièvre

[saraedum]

Changed commit from 8df690f to 96a0c45

[saraedum]

Reviewer: Julian Rüth

[saraedum]

Changed keywords from none to days101

[vbraun]

Changed branch from u/slelievre/mrs/14/update-maintained-2019 to 96a0c45

[embray]

comment:7

Not in Sage 8.8. Let's please to try keep tickets' milestones related to the release in which we actually intend to include them, and in particular the release in which they were actually included, especially when closing tickets.