README.md in trackler-2.2.1.57

- old
+ new

@@ -33,9 +33,15 @@
 
 The Hamming distance is only defined for sequences of equal length. This means
 that based on the definition, each language could deal with getting sequences
 of equal length differently.
 
+You may be wondering about the `cases_test.go` file. We explain it in the
+[leap exercise][leap-exercise-readme].
+
+[leap-exercise-readme]: https://github.com/exercism/go/blob/master/exercises/leap/README.md 
+
+
 ## Running the tests
 
 To run the tests run the command `go test` from within the exercise directory.
 
 If the test suite contains benchmarks, you can run these with the `-bench`