Allow all args on Mix.Dep.loaded

Even though the API was private, developers were abusing it.
So we allow it to work for now until we remove it in future
versions.

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

Author: José Valim

lib/mix/lib/mix/dep.ex

@@ -153,8 +153,8 @@ defmodule Mix.Dep do
   # TODO: Remove this on v1.8
   @doc false
   @deprecated "Mix.Dep.loaded/1 was private API and you should not use it"
-  def loaded([]) do
-    load_on_environment([])
+  def loaded(opts) do
+    load_on_environment(opts)
   end
 
   @doc """