Add bundled signature for Apache Commons IO 2.6

[joschi]

This PR adds bundled signatures for the recently released Apache Commons IO 2.6.

It's a bit lazy because it simply includes the previous bundled signatures, though. 😉

[uschindler]

Thanks @joschi - when I released latest version, 2.6 was not yet out. But I aggree, this would be a first step. The last time I was looking into the API differences between previous version and new version, so I was able to quickly figure out new "forbidden" apis. It would be good to do this before next relaese.

Otherwise looks fine (similar to the other signature files).

[uschindler]

Thanks!

[uschindler]

Hi @joschi,
I checked the differences 2.5->2.6 and I found no new charset related issues:
https://abi-laboratory.pro/java/tracker/compat_report/commons-io/2.5/2.6/f223d/bin_compat_report.html

[joschi]

@uschindler Thanks for the feedback!

And of course thanks for continuously maintaining this fine project. 😃

[uschindler]

Release including Java 10 support is coming soon. It's in staging and it's currently tested with Lucene, Solr, and Elasticsearch!