Remove parameter from stop method

src/spectator/formatting/broadcast_formatter.cr

@@ -50,8 +50,8 @@ module Spectator::Formatting
     end
 
     # :ditto:
-    def stop(notification)
+    def stop
-      @formatters.each(&.stop(notification))
+      @formatters.each(&.stop)
     end
 
     # :ditto:

src/spectator/formatting/formatter.cr

@@ -84,7 +84,7 @@ module Spectator::Formatting
     # Invoked after all tests that will run have completed.
     # When this method is called, it should be considered that the testing is done.
     # Summary (dump) methods will be called after this.
-    def stop(_notification)
+    def stop
     end
 
     # Invoked after all examples finished.

src/spectator/formatting/progress_formatter.cr

@@ -41,7 +41,7 @@ module Spectator::Formatting
     end
 
     # Produces a new line after the tests complete.
-    def stop(_notification)
+    def stop
       @io.puts
     end
   end

src/spectator/spec/events.cr

@@ -32,7 +32,7 @@ module Spectator
       # Triggers the 'stop' event.
       # See `Formatting::Formatter#stop`
       private def stop
-        formatter.stop(nil)
+        formatter.stop
       end
 
       # Triggers the 'dump' events.