fix travis.

Author: makasim

.travis.yml

@@ -59,8 +59,8 @@ script:
     - if [ "$PHP_CS_FIXER" = true ]; then IFS=$'\n'; COMMIT_SCA_FILES=($(git diff --name-only --diff-filter=ACMRTUXB "${TRAVIS_COMMIT_RANGE}")); unset IFS; fi
     - if [ "$PHP_CS_FIXER" = true ]; then ./bin/php-cs-fixer fix --config=.php_cs.dist -v --dry-run --stop-on-violation --using-cache=no --path-mode=intersection -- "${COMMIT_SCA_FILES[@]}"; fi
     - if [ "$UNIT_TESTS" = true ]; then bin/phpunit --exclude-group=functional; fi
-    - if [ "$FUNCTIONAL_TESTS" = true ]; then bin/dev -t --exclude-group=rdkafka; fi
-    - if [ "RDKAFKA_TESTS" = true ]; then bin/dev -t --group=rdkafka; fi
+    - if [ "$FUNCTIONAL_TESTS" = true ]; then bin/dev -t "--exclude-group=rdkafka"; fi
+    - if [ "RDKAFKA_TESTS" = true ]; then bin/dev -t "--group=rdkafka"; fi
 
 notifications:
   webhooks: