chore(deps): update mime requirement from ~> 1.6.0 to ~> 2.0.0

Updates the requirements on [mime](https://github.com/elixir-plug/mime) to permit the latest version.
- [Release notes](https://github.com/elixir-plug/mime/releases)
- [Changelog](https://github.com/elixir-plug/mime/blob/v2.0.0/CHANGELOG.md)
- [Commits](https://github.com/elixir-plug/mime/compare/v1.6.0...v2.0.0)

apps/content/mix.exs

@@ -48,7 +48,7 @@ defmodule Legendary.Content.MixProject do
       {:gettext, "~> 0.11"},
       {:html_sanitize_ex, "~> 1.4.1"},
       {:jason, "~> 1.0"},
-      {:mime, "~> 1.6.0"},
+      {:mime, "~> 2.0.0"},
       {:mock, "~> 0.3.0", only: :test},
       {:meck, "~> 0.8.13", only: :test},
       {:neotomex, "~> 0.1.7"},