Merge pull request #1642 from TechEmpower/slim-hhvm

forgot to change setup file to hhvm

frameworks/PHP/php-slim/benchmark_config.json

@@ -22,7 +22,7 @@
       "versus": "php"
     },
     "hhvm": {
-      "setup_file": "setup",
+      "setup_file": "setup_hhvm",
       "json_url": "/json",
       "db_url": "/db",
       "query_url": "/dbs?queries=",