Making peep a nonoptional dep

lib/prom_ex.ex

@@ -62,8 +62,7 @@ defmodule PromEx do
 
   1. [TelemetryMetricsPrometheus.Core](https://github.com/beam-telemetry/telemetry_metrics_prometheus_core) - This is the
   default adapter and is included with PromEx.
-  2. [Peep](https://github.com/rkallos/peep) - In order to use Peep as your storage adapter, you need to add `:peep`
-  to your list of dependencies like so: `{:peep, "~> 3.2"}`. After running `mix deps.get` you will need to add the following
+  2. [Peep](https://github.com/rkallos/peep) - In order to use Peep as your storage adapter,  you will need to add the following
   to your `config.exs` file:
 
       ```elixir

lib/prom_ex/storage/peep.ex

@@ -1,27 +1,25 @@
-if Code.ensure_loaded?(Peep) do
-  defmodule PromEx.Storage.Peep do
-    @moduledoc """
-    This store uses [Peep](https://github.com/rkallos/peep) as the storage
-    mechanism for metrics.
-    """
+defmodule PromEx.Storage.Peep do
+  @moduledoc """
+  This store uses [Peep](https://github.com/rkallos/peep) as the storage
+  mechanism for metrics.
+  """
 
-    @behaviour PromEx.Storage
+  @behaviour PromEx.Storage
 
-    @impl true
-    def scrape(name) do
-      Peep.get_all_metrics(name)
-      |> Peep.Prometheus.export()
-      |> IO.iodata_to_binary()
-    end
+  @impl true
+  def scrape(name) do
+    Peep.get_all_metrics(name)
+    |> Peep.Prometheus.export()
+    |> IO.iodata_to_binary()
+  end
 
-    @impl true
-    def child_spec(name, metrics) do
-      opts = [
-        name: name,
-        metrics: metrics
-      ]
+  @impl true
+  def child_spec(name, metrics) do
+    opts = [
+      name: name,
+      metrics: metrics
+    ]
 
-      Peep.child_spec(opts)
-    end
+    Peep.child_spec(opts)
   end
 end

mix.exs

@@ -61,7 +61,7 @@ defmodule PromEx.MixProject do
       {:telemetry_poller, "~> 1.1"},
       {:telemetry_metrics, "~> 1.0"},
       {:telemetry_metrics_prometheus_core, "~> 1.2"},
-      {:peep, "~> 2.0 or ~> 3.0", optional: true},
+      {:peep, "~> 3.0"},
       {:plug_cowboy, ">= 2.6.0"},
       {:octo_fetch, "~> 0.4"},