Fix preferred_envs warning in mix.exs

Author: sabiwara

mix.exs

@@ -11,13 +11,6 @@ defmodule Cmp.MixProject do
       elixir: "~> 1.13",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
-      preferred_cli_env: [
-        docs: :docs,
-        "hex.publish": :docs,
-        dialyzer: :test,
-        "test.unit": :test,
-        "test.prop": :test
-      ],
       dialyzer: [flags: [:missing_return, :extra_return]],
       aliases: aliases(),
       consolidate_protocols: Mix.env() != :test,
@@ -63,6 +56,18 @@ defmodule Cmp.MixProject do
     ]
   end
 
+  def cli do
+    [
+      preferred_envs: [
+        docs: :docs,
+        "hex.publish": :docs,
+        dialyzer: :test,
+        "test.unit": :test,
+        "test.prop": :test
+      ]
+    ]
+  end
+
   defp docs do
     [
       main: "Cmp",