Bump sgml-stream to ^0.5

Author: hershel-theodore-layton

composer.json

@@ -5,7 +5,7 @@
   "require": {
     "hhvm": "^4.73",
     "hhvm/hsl": "^4.41",
-    "hershel-theodore-layton/sgml-stream": "^0.4"
+    "hershel-theodore-layton/sgml-stream": "^0.5"
   },
   "require-dev": {
     "hhvm/hhvm-autoload": "^3.2",