Library builders: What versions of Elixir to support? When to stop supporting older Elixir versions?

in Travis you can run your test suite on many different Elixir versions.
This is how I found out that I am now, while upgrading dependencies, often no longer able to support elixir v1.2 (but I personally think that that version is now old enough to leave behind).

Currently, my plain test .travis.yml configuration looks like this:

language: elixir
elixir:
  - 1.3.2
  - 1.4.5
  - 1.5.3
  - 1.6.6
  - 1.7.4
  - 1.8.0
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