README.md in trackler-2.2.1.44

- old
+ new

@@ -2,10 +2,10 @@
 
 Given a year, report if it is a leap year.
 
 The tricky thing here is that a leap year in the Gregorian calendar occurs:
 
-```plain
+```text
 on every year that is evenly divisible by 4
   except every year that is evenly divisible by 100
     unless the year is also evenly divisible by 400
 ```
 