RbCommitHook : add missing dependency on rbtools
(Portage version: 2.2.1/hg/Linux x86_64, unsigned Manifest commit)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>python</herd>
<maintainer>
<email>idella4@gentoo.org</email>
<name>Ian Delaney</name>
</maintainer>
</pkgmetadata>