AOSA-2017-0002: Update icoutils

Please update your icoutils package to version 0.31.1.

Secveral vulnerabilities were recently disclosed in the wrestool utility, an integral part of the icoutils toolkit:

CVE-2017-5331, CVE-2017-5332, CVE-2017-5333.

Relevant documentation:

• Original oss-security mailing list post.