Remove whitelisted space as it is no longer necessary

cli.py

@@ -47,8 +47,8 @@ if __name__ == '__main__':
         if args.separator in args.disallow:
             sys.exit('Disallowing your chosen separator makes no sense!')
 
-    # declare special characters that will not be removed (spaces are handled elsewhere)
-    whitelist = {' ', '.', '-'}
+    # declare special characters that will not be removed
+    whitelist = {'.', '-'}
     if args.whitelist:
         whitelist = set(args.whitelist.split())