README.md in trackler-2.2.1.48

- old
+ new

@@ -8,10 +8,10 @@
 
 This is a [cumulative song](http://en.wikipedia.org/wiki/Cumulative_song) of unknown origin.
 
 This is one of many common variants.
 
-```plain
+```text
 I know an old lady who swallowed a fly.
 I don't know why she swallowed the fly. Perhaps she'll die.
 
 I know an old lady who swallowed a spider.
 It wriggled and jiggled and tickled inside her.