LUCENE-5934: Add Ian Lea to CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1624146 13f79535-47bb-0310-9956-ffa450edef68
Fix over-long CHANGES.txt line.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1624151 13f79535-47bb-0310-9956-ffa450edef68