chore(deps): update dependency gettext to ~> 0.20 (#19)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [gettext](https://hex.pm/packages/gettext) | minor | `~> 0.19` -> `~> 0.20` |

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #19
Co-authored-by: renovate-bot <renovate-bot@dubas.dev>
Co-committed-by: renovate-bot <renovate-bot@dubas.dev>

mix.exs

@@ -35,7 +35,7 @@ defmodule Wabanex.MixProject do
       {:crudry, "~> 2.4.0"},
       {:dialyxir, "~> 1.1", only: [:dev, :test], runtime: false},
       {:ecto_sql, "~> 3.4"},
-      {:gettext, "~> 0.19"},
+      {:gettext, "~> 0.20"},
       {:jason, "~> 1.0"},
       {:junit_formatter, "~> 3.1", only: [:test]},
       {:lcov_ex, "~> 0.2", only: [:dev, :test], runtime: false},