update to org.apache.sling.commons.json 2.0.20
update to org.apache.sling.commons.json 2.0.20

git-svn-id: 6eed74fe9a15c8da84b9a8d7f2960c0406113ece@1788072 13f79535-47bb-0310-9956-ffa450edef68

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