no Jira - rename release candidate to release

git-svn-id: https://svn.apache.org/repos/asf/uima/build/tags/parent-pom-6@1503206 13f79535-47bb-0310-9956-ffa450edef68
tree: 1800ac477e8307d09c6fb83741251295109f76cc
  1. marker-file-identifying-parent-pom
  2. pom.xml
  3. README.txt