[TEST] Added missing semicolon (#544)

The missing semicolon is causing recent Travis CI builds for the 5.0 branch to fail.

Author: a-roussos

.travis.yml

@@ -36,7 +36,7 @@ env:
     - JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre"
 
 before_install:
-  - if [ $TRAVIS_PHP_VERSION = '5.6' ]; then pecl uninstall json && pecl install json-1.3.7 fi
+  - if [ $TRAVIS_PHP_VERSION = '5.6' ]; then pecl uninstall json && pecl install json-1.3.7; fi
   - sudo update-java-alternatives -s java-8-oracle
   - ./travis/download_and_run_es.sh