Doc: adding ueberauth to the applications list is no longer necessary

[FractalWire]

The doc mention both in the main repo and in the various strategy repos that you should add Ueberauth and its strategies to the applications list like so:

def application do
  # Add the application to your list of applications.
  # This will ensure that it will be included in a release.
  [applications: [:logger, :ueberauth]]
end

For recent version of Elixir, this is no longer necessary and will, in fact, cause an error difficult to understand.

The doc should be updated to mention this change.

https://elixirforum.com/t/error-dbconnection-when-running-mix-phx-server/22652/2
https://www.amberbit.com/blog/2017/9/22/elixir-applications-vs-extra_applications-guide/

[doomspork]

Hi @FractalWire would you mind submitting a PR?

[FractalWire]

Sure ;)
#118

[Hanspagh]

Closed by #118