[IO] Build fails with 3 checkstyle errors

[Rob Spoor]

See https://travis-ci.org/apache/commons-io/jobs/569951808. Two of the 
errors report an unused import which is in fact used in Javadoc. The 
other is a protected method without Javadoc.

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org
For additional commands, e-mail: dev-h...@commons.apache.org