[maven-release-plugin] prepare release json-io-2.2.6
[maven-release-plugin] prepare release json-io-2.2.6

KaiHufenbach/json-io,kpartlow/json-io,jdereg/json-io,kpartlow/json-io,MaTriXy/json-io,MaTriXy/json-io,KaiHufenbach/json-io,jdereg/json-io