.travis.yml: fix build by using the correct operator for logical OR.

Prior this change it was failing with the following error:
/home/travis/.travis/job_stages: line 567: expected `)'
/home/travis/.travis/job_stages: line 567: syntax error near `-a'
/home/travis/.travis/job_stages: line 567: `  if [[ ($TRAVIS_BRANCH = prod) && ("$SPRING_PROFILES_ACTIVE" = "travis" -a "$TRAVIS_PULL_REQUEST" = "false") ]]; then'

Correction for d5289a4 commit.

Author: php-coder

.travis.yml

@@ -43,7 +43,7 @@ deploy:
   script: ./src/main/scripts/ci/deploy.sh
   on:
     branch: prod
-    condition: '"$SPRING_PROFILES_ACTIVE" = "travis" -a "$TRAVIS_PULL_REQUEST" = "false"'
+    condition: '"$SPRING_PROFILES_ACTIVE" = "travis" && "$TRAVIS_PULL_REQUEST" = "false"'
   skip_cleanup: true
 
 jdk: