Remove unused use statement

AydinHassan · AydinHassan · commit aeb103baf2f3 · 2016-11-22T00:04:11.000+01:00
diff --git a/src/Exception/InvalidArgumentException.php b/src/Exception/InvalidArgumentException.php
@@ -1,7 +1,6 @@
 <?php
 
 namespace PhpSchool\PhpWorkshop\Exception;
-use PhpSchool\PhpWorkshop\Exercise\ExerciseInterface;
 
 /**
  * Represents invalid argument exceptions.
