Removes unused import.
Removes unused import.

yottamoto/java-koans,matyb/java-koans,rloomans/java-koans,DavidWhitlock/java-koans,matyb/java-koans,yottamoto/java-koans,DavidWhitlock/java-koans,rloomans/java-koans,yottamoto/java-koans,matyb/java-koans