Removed unneeded test harness macro

test/koans/enum_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule EnumTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Enums" do
     answers = [

test/koans/equalities_koan_test.exs

@@ -1,6 +1,6 @@
 defmodule EqualitiesTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Equalities" do
     answers = [

test/koans/functions_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule FunctionsTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Functions" do
     answers = [

test/koans/lists_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule ListsTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Lists" do
     answers = [1,

test/koans/maps_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule MapsTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Maps" do
     answers = [

test/koans/patterns_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule PatternsTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Pattern Matching" do
     answers = [

test/koans/processes_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule ProcessesTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Processes" do
     answers = [

test/koans/strings_koan_test.exs

@@ -1,6 +1,6 @@
 defmodule StringTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Strings" do
     answers = [

test/koans/structs_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule StructsTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Structs" do
     answers = [

test/koans/tasks_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule TasksTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
   test "Tasks" do
     answers = [

test/koans/tuples_koans_test.exs

@@ -1,6 +1,6 @@
 defmodule TupleTests do
   use ExUnit.Case
-  use TestHarness
+  import TestHarness
 
  test "Tuples" do
     answers = [