update docs to recommend Application environment for adding Logger backend

README.md

@@ -54,23 +54,11 @@ More information on why this may be necessary can be found here: https://github.
 
 This library comes with an extension to capture all error messages that the Plug handler might not.  This is based on [Logger.Backend](https://hexdocs.pm/logger/Logger.html#module-backends).
 
-To set this up, add `{:ok, _} = Logger.add_backend(Sentry.LoggerBackend)` to your application's start function. Example:
-
 ```diff
- # lib/my_app/application.ex
- # ...
- def start(_type, _opts) do
-   children = [
-     supervisor(MyApp.Repo, []),
-     supervisor(MyAppWeb.Endpoint, [])
-   ]
-
-   opts = [strategy: :one_for_one, name: MyApp.Supervisor]
-
-+ {:ok, _} = Logger.add_backend(Sentry.LoggerBackend)
+# config/config.exs
 
-   Supervisor.start_link(children, opts)
- end
++ config :logger,
++  backends: [:console, Sentry.LoggerBackend]
 ```
 
 The backend can also be configured to capture Logger metadata, which is detailed [here](https://hexdocs.pm/sentry/Sentry.LoggerBackend.html).

lib/sentry/logger_backend.ex

@@ -4,26 +4,16 @@ defmodule Sentry.LoggerBackend do
   crashed processes.  It replaces the previous `Sentry.Logger` sytem.
 
   To include the backend in your application, the backend can be added in your
-  application file:
+  configuration file:
 
-      def start(_type, _opts) do
-        children = [
-          supervisor(MyApp.Repo, []),
-          supervisor(MyAppWeb.Endpoint, [])
-        ]
-
-        opts = [strategy: :one_for_one, name: MyApp.Supervisor]
-
-        {:ok, _} = Logger.add_backend(Sentry.LoggerBackend)
-
-        Supervisor.start_link(children, opts)
-      end
+      config :logger,
+        backends: [:console, Sentry.LoggerBackend]
 
   If you are on OTP 21+ and would like to configure the backend to include metadata from
   `Logger.metadata/0` in reported events, it can be enabled:
 
-      {:ok, _} = Logger.add_backend(Sentry.LoggerBackend)
-      Logger.configure_backend(Sentry.LoggerBackend, include_logger_metadata: true)
+      config :logger, Sentry.LoggerBackend,
+        include_logger_metadata: true
 
   It is important to be aware of whether this will include sensitive information
   in Sentry events before enabling it.