HCATALOG-640 CHANGES.txt still lists 0.5 as unreleased


git-svn-id: https://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.5@1459027 13f79535-47bb-0310-9956-ffa450edef68
HCATALOG-625 HCatalog 0.5.0 installation document is outdated


git-svn-id: https://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.5@1459035 13f79535-47bb-0310-9956-ffa450edef68