README.md in trackler-2.2.1.12

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 [exercism help page](http://exercism.io/languages/groovy).
 
 Run the tests by executing the test script.
 
 ```
-$ groovy ./PhraseSpec.groovy
+$ groovy ./WordCountSpec.groovy
 ```
 
 After the first test(s) pass, continue by commenting out or removing the `@Ignore` annotations prepending other tests.
 
 When all tests pass, congratulations!