Upgrade nodemailer, request and assert npm packages

package.json

@@ -36,7 +36,7 @@
     "express-session": "^1.14.2",
     "ldapjs": "^1.0.1",
     "nedb": "^1.8.0",
-    "nodemailer": "^2.7.0",
+    "nodemailer": "^4.0.1",
     "object-path": "^0.11.3",
     "pug": "^2.0.0-rc.2",
     "randomstring": "^1.1.5",
@@ -46,7 +46,6 @@
     "yamljs": "^0.2.8"
   },
   "devDependencies": {
-    "@types/assert": "0.0.31",
     "@types/bluebird": "^3.5.4",
     "@types/body-parser": "^1.16.3",
     "@types/ejs": "^2.3.33",
@@ -63,7 +62,7 @@
     "@types/proxyquire": "^1.3.27",
     "@types/query-string": "^4.3.1",
     "@types/randomstring": "^1.1.5",
-    "@types/request": "0.0.43",
+    "@types/request": "0.0.45",
     "@types/sinon": "^2.2.1",
     "@types/speakeasy": "^2.0.1",
     "@types/tmp": "0.0.33",
@@ -86,9 +85,10 @@
     "mockdate": "^2.0.1",
     "notifyjs-browser": "^0.4.2",
     "nyc": "^10.3.2",
+    "power-assert": "^1.4.4",
     "proxyquire": "^1.8.0",
     "query-string": "^4.3.4",
-    "request": "^2.79.0",
+    "request": "^2.81.0",
     "should": "^11.1.1",
     "sinon": "^1.17.6",
     "sinon-promise": "^0.1.3",