fix(package): update express-session to version 1.15.2

greenkeeper[bot] · Sashko Stubailo · commit 1fa080312699 · 2017-03-26T18:12:54.000-07:00
https://greenkeeper.io/
diff --git a/package.json b/package.json
@@ -49,7 +49,7 @@
     "dataloader": "1.3.0",
     "dotenv": "4.0.0",
     "express": "4.15.2",
-    "express-session": "1.15.1",
+    "express-session": "1.15.2",
     "graphql": "^0.9.1",
     "graphql-server-express": "^0.6.0",
     "graphql-subscriptions": "^0.3.0",
