Upgrade to RDF.ex v2.1

Author: marcelotto

mix.exs

@@ -108,7 +108,7 @@ defmodule RDF.XML.MixProject do
   defp earl_reports(_) do
     files = ["test/acceptance/w3c_test.exs"]
 
-    Mix.Task.run("test", ["--formatter", "RDF.EarlFormatter", "--seed", "0"] ++ files)
+    Mix.Task.run("test", ["--formatter", "RDF.Test.EarlFormatter", "--seed", "0"] ++ files)
   end
 
   defp elixirc_paths(:test), do: ["lib", "test/support"]

test/acceptance/w3c_test.exs

@@ -6,7 +6,7 @@ defmodule RDF.XML.W3C.Test do
   """
 
   use ExUnit.Case, async: false
-  use RDF.EarlFormatter, test_suite: :rdf_xml
+  use RDF.Test.EarlFormatter, test_suite: :rdf_xml
 
   ExUnit.Case.register_attribute(__ENV__, :test_case)