message: Clarify the current state of glium's development
  The current writing reads as though *noone* currently maintains glium
  which is not the case. This aims to clarify the situation a little.
diff: ## Note to current and future Glium users:
  -Glium is no longer maintained, for more information visit the [post-mortem](https://users.rust-lang.org/t/glium-post-mortem/7063).
  +Glium is [no longer actively developed by its original
  +author](https://users.rust-lang.org/t/glium-post-mortem/7063). That said, PRs
  +are still welcome and maintenance is continued by the surrounding community. If
  +you use Glium and would be interested in seeing it moved to its own
  +organisation, you can express your interest
  +[here](https://github.com/tomaka/glium/issues/532).
  ##
  