lock event-stream to 3.3.4 in package.json

package.json

@@ -78,7 +78,7 @@
     "documentdb": "^1.5.1",
     "electron-mksnapshot": "~2.0.0",
     "eslint": "^3.4.0",
-    "event-stream": "^3.1.7",
+    "event-stream": "3.3.4",
     "express": "^4.13.1",
     "glob": "^5.0.13",
     "gulp": "^3.8.9",

yarn.lock

@@ -2617,7 +2617,7 @@ event-emitter@~0.3.5:
     d "1"
     es5-ext "~0.10.14"
 
-event-stream@^3.1.7, event-stream@^3.3.1, event-stream@^3.3.4, event-stream@~3.3.4:
+event-stream@3.3.4, event-stream@^3.1.7, event-stream@^3.3.1, event-stream@^3.3.4, event-stream@~3.3.4:
   version "3.3.4"
   resolved "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.4.tgz#4ab4c9a0f5a54db9338b4c34d86bfce8f4b35571"
   integrity sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=