README.md in trackler-2.2.1.50

- old
+ new

@@ -24,11 +24,11 @@
 and `r` is the number of rows.
 
 Our normalized text is 54 characters long, dictating a rectangle with
 `c = 8` and `r = 7`:
 
-```plain
+```text
 ifmanwas
 meanttos
 tayonthe
 groundgo
 dwouldha
@@ -39,25 +39,25 @@
 The coded message is obtained by reading down the columns going left to
 right.
 
 The message above is coded as:
 
-```plain
+```text
 imtgdvsfearwermayoogoanouuiontnnlvtwttddesaohghnsseoau
 ```
 
 Output the encoded text in chunks.  Phrases that fill perfect squares
 `(r X r)` should be output in `r`-length chunks separated by spaces.
 Imperfect squares will have `n` empty spaces.  Those spaces should be distributed evenly across the last `n` rows.
 
-```plain
+```text
 imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn sseoau
 ```
 
 Notice that were we to stack these, we could visually decode the
 cyphertext back in to the original message:
 
-```plain
+```text
 imtgdvs
 fearwer
 mayoogo
 anouuio
 ntnnlvt