adding a fix for travis issue [ref HEAD is not a symbolic ref]

Author: Ashish Aggarwal

.travis/deploy.sh

@@ -1,13 +1,23 @@
 #!/bin/bash
 cd `dirname $0`/..
 
+function fix_git {
+    echo "Fixing git setup for $TRAVIS_BRANCH"
+    git checkout ${TRAVIS_BRANCH}
+    git branch -u origin/${TRAVIS_BRANCH}
+    git config branch.${TRAVIS_BRANCH}.remote origin
+    git config branch.${TRAVIS_BRANCH}.merge refs/heads/${TRAVIS_BRANCH}
+}
+
+
 if [ "${TRAVIS_BRANCH}" == 'master' -a "${TRAVIS_PULL_REQUEST}" == 'false' ] || [ -n "${TRAVIS_TAG}" ]; then
   if [[ -z "${SONATYPE_USERNAME}" || -z "${SONATYPE_PASSWORD}" ]]; then
     echo "ERROR! Please set SONATYPE_USERNAME and SONATYPE_PASSWORD environment variable"
     exit 1
   fi
 
   if [ ! -z "${TRAVIS_TAG}" ]; then
+    fix_git
     echo "travis tag is set -> updating pom.xml <version> attribute to ${TRAVIS_TAG}"
     ./mvnw --batch-mode --settings .travis/settings.xml -DskipTests=true -DreleaseVersion=${TRAVIS_TAG} release:clean release:prepare release:perform
     SUCCESS=$?