[UIMA-6293] Migrate UIMA Parent POM to GitHub

- Move tag to new location

git-svn-id: https://svn.apache.org/repos/asf/uima/build/parent-pom/tags/parent-pom-4@1883115 13f79535-47bb-0310-9956-ffa450edef68
tree: 1dce07084d00b1b17512c5cf32fb88144d358670
  1. marker-file-identifying-parent-pom
  2. pom.xml
  3. README.txt