add .formatter.exs + format

lib/display/progress_bar.ex

@@ -1,5 +1,4 @@
 defmodule Display.ProgressBar do
-
   @progress_bar_length 30
 
   def progress_bar(%{current: current, total: total}) do
@@ -9,11 +8,12 @@ defmodule Display.ProgressBar do
   end
 
   defp calculate_progress(current, total) do
-    round( (current/total) * @progress_bar_length)
+    round(current / total * @progress_bar_length)
   end
 
   defp build_arrow(0), do: ""
+
   defp build_arrow(length) do
-    String.duplicate("=", length-1) <> ">"
+    String.duplicate("=", length - 1) <> ">"
   end
 end