Fix readme download link

Description

Previous version pointed to v1.0, which dates back from 2013. This
misleads users who try to install the old version in newer open edx
install. See for instance: https://github.com/overhangio/tutor/issues/256

Assignee

Ned Batchelder

Reporter

Open Source Pull Request Bot

Labels

None

Contributor Name

Régis Behmo

Repo

edx/edx-demo-course

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

Site Delivery & Infrastructure

Platform Map Area (Levels 3 & 4)

None

Priority

Unset
Configure