Move task itself to test to avoid warnings.

Author: mpaulucci

lib/mix/tasks/generate_spec_tests.ex renamed to test/spec/tasks/generate_spec_tests.ex

@@ -63,6 +63,7 @@ defmodule Mix.Tasks.GenerateSpecTests do
     header = """
     defmodule #{module_name} do
       use ExUnit.Case, async: false
+      use Patch
 
       setup_all do
         start_link_supervised!({LambdaEthereumConsensus.Store.Db, db_location: "test/generated/#{config}_#{fork}_#{runner}_test_db"})