Adds support of geo 4.0

[elfenlaid]

The changes add support for 4.0 version of /~https://github.com/felt/geo

They also follow up this PR pkinney/envelope_ex#8

---

Aside from the PR, I noticed that tests could fail without declaring :poison in the applications list. It could be to my local setup, but the following tweak did the trick:

  def application do
-    [applications: [:logger, :geo, :seg_seg, :vector]]
+    [applications: [:logger, :geo, :seg_seg, :vector, :poison]]
  end

[pkinney]

Released as v.1.0.1

[elfenlaid]

Amazing, thank you ❤️