Upgrade to Meteor 2.3.4

Thanks to xet7 !

package.json

@@ -31,6 +31,7 @@
     "core-js": "^2.6.12",
     "dompurify": "^2.3.0",
     "es6-promise": "^4.2.4",
+    "escape-string-regexp": "^5.0.0",
     "exceljs": "^4.2.1",
     "fibers": "^5.0.0",
     "gridfs-stream": "https://github.com/wekan/gridfs-stream/tarball/master",
@@ -42,11 +43,13 @@
     "markdown-it": "^12.3.2",
     "markdown-it-emoji": "^2.0.0",
     "meteor-node-stubs": "^1.1.0",
+    "moment": "^2.29.1",
     "mongodb": "^3.7.3",
     "os": "^0.1.2",
     "page": "^1.11.5",
     "papaparse": "^5.3.1",
     "qs": "^6.10.1",
+    "simpl-schema": "^1.12.0",
     "source-map-support": "^0.5.19"
   },
   "meteor": {