Add jsonwebtoken package

services/web/package.json

@@ -30,6 +30,7 @@
     "http-proxy": "^1.8.1",
     "ioredis": "^2.4.0",
     "jade": "~1.3.1",
+    "jsonwebtoken": "^8.0.1",
     "ldapjs": "^0.7.1",
     "lodash": "^4.13.1",
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#master",