pom.xml: updates for release 0.8.5
pom.xml: updates for release 0.8.5

Add new event type for INVOICE_NOTIFICATION

Signed-off-by: stephane brossier <c1fb28815da1df8a6921017a648d6c4b5d859b78@groupon.com>

killbill/killbill-plugin-api,killbill/killbill-plugin-api