Fix incorrect JIRA number in CHANGES.txt for MAPREDUCE-3278. (erroneously committed as MAPREDUCE-3287)
Fix incorrect JIRA number in CHANGES.txt for MAPREDUCE-3278. (erroneously committed as MAPREDUCE-3287)

git-svn-id: 7d7377a7daa0560c08de36e9018aba2351968394@1201089 13f79535-47bb-0310-9956-ffa450edef68

awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop