Fix checkstyle issue

Author: patrickfav

src/main/java/at/favre/lib/bytes/BytesTransformers.java

@@ -4,7 +4,6 @@
 import javax.crypto.spec.SecretKeySpec;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
-import java.io.IOException;
 import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.Comparator;