Added PHP requirement for composer.

cjsaylor · cjsaylor · commit de23fafc3697 · 2016-02-29T14:16:19.000-05:00
diff --git a/composer.json b/composer.json
@@ -10,6 +10,7 @@
     ],
     "license": "MIT",
     "require": {
+        "php": ">=5.4.0",
         "elasticsearch/elasticsearch": ">=1.0 <3.0",
         "psr/log": "^1.0"
     },
