remover excessive whitespace

src/re_frame/core.cljs

@@ -36,13 +36,11 @@
 ;;
 ;; https://github.com/Day8/re-frame/wiki/Undo-&-Redo
 
-
 (def undoable    undo/undoable)
 (def set-max-undos!  undo/set-max-undos!)
 (def set-undo-path!  undo/set-undo-path!)
 
 
-
 ;; --  Logging -----
 ;; re-frame uses the logging functions: warn, log, error, group and groupEnd
 ;; By default, these functions map directly to the js/console implementations,