Update supported Elixir, OTP and Ecto versions #51

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use Mix.Config is deprecated. Use the Config module instead

Mix.Config.config/2 is deprecated. Use the Config module instead

use Mix.Config is deprecated. Use the Config module instead

Mix.Config.config/2 is deprecated. Use the Config module instead

use Mix.Config is deprecated. Use the Config module instead

Mix.Config.config/2 is deprecated. Use the Config module instead