Merge pull request #1255 from paulo-ferraz-oliveira/fix/dialyzer-in-c…

…i-elixir-1.15

Adapt to 1.15's code path pruning, for dialyxir'ing purposes

mix.exs

@@ -33,7 +33,8 @@ defmodule Absinthe.Mixfile do
         plt_add_deps: :apps_direct,
         plt_file: {:no_warn, "priv/plts/project.plt"},
         plt_add_apps: [:mix, :dataloader, :decimal, :ex_unit]
-      ]
+      ],
+      prune_code_paths: prune_code_paths(Mix.env())
     ]
   end
 
@@ -85,6 +86,9 @@ defmodule Absinthe.Mixfile do
     ]
   end
 
+  defp prune_code_paths(:test), do: false
+  defp prune_code_paths(_), do: true
+
   #
   # Documentation
   #