Simpler progressbar and handle --koan=<KOAN> better

test/display_test.exs

@@ -1,18 +1,19 @@
 defmodule DisplayTest do
   use ExUnit.Case
 
-  test "puts counter on the right until half the koans are complete" do
-    bar = Display.progress_bar(%{total: 12, current: 3})
-    assert bar == "|==========>        (3/12)              |"
+  test "empty bar" do
+    bar = Display.progress_bar(%{total: 12, current: 0})
+    assert bar == "|                              | 0 of 12"
   end
 
-  test "puts the counter on the left after half the koans are complete" do
-    bar = Display.progress_bar(%{total: 12, current: 10})
-    assert bar == "|(10/12)========================>       |"
+  test "puts counter on the right until half the koans are complete" do
+    bar = Display.progress_bar(%{total: 12, current: 3})
+    assert bar == "|=======>                      | 3 of 12"
   end
 
+
   test "full bar" do
     bar = Display.progress_bar(%{total: 12, current: 12})
-    assert bar == "|(12/12)===============================>|"
+    assert bar == "|=============================>| 12 of 12"
   end
 end