README.md in trackler-2.2.1.54

- old
+ new
@@ -16,61 +16,60 @@
 but they should be stripped before checking. All other non-digit characters
 are disallowed.
 
 ## Example 1: valid credit card number
 
-```
+```text
 4539 1488 0343 6467
 ```
 
 The first step of the Luhn algorithm is to double every second digit,
 starting from the right. We will be doubling
 
-```
+```text
 4_3_ 1_8_ 0_4_ 6_6_
 ```
 
 If doubling the number results in a number greater than 9 then subtract 9
 from the product. The results of our doubling:
 
-```
+```text
 8569 2478 0383 3437
 ```
 
 Then sum all of the digits:
 
-```
+```text
 8+5+6+9+2+4+7+8+0+3+8+3+3+4+3+7 = 80
 ```
 
 If the sum is evenly divisible by 10, then the number is valid. This number is valid!
 
 ## Example 2: invalid credit card number
 
-```
+```text
 8273 1232 7352 0569
 ```
 
 Double the second digits, starting from the right
 
-```
+```text
 7253 2262 5312 0539
 ```
 
 Sum the digits
 
-```
+```text
 7+2+5+3+2+2+6+2+5+3+1+2+0+5+3+9 = 57
 ```
 
 57 is not evenly divisible by 10, so this number is not valid.
 
-### Submitting Exercises
+## Submitting Exercises
 
 Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.
 
 For example, if you're submitting `bob.py` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/python/bob/bob.py`.
-
 
 For more detailed information about running tests, code style and linting,
 please see the [help page](http://exercism.io/languages/python).
 
 ## Source