[@types/mongoose] Added flag for useNewUrlParser in ConnectionOptions (#27050)

* feat(mongoose): Added flag for new url parser

* feat(mongoose): added test for useNewUrlParser flag

* feat(mongoose): bumped up mongoose version

types/mongoose/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for Mongoose 5.0.15
+// Type definitions for Mongoose 5.2.1
 // Project: http://mongoosejs.com/
 // Definitions by: horiuchi <https://github.com/horiuchi>
 //                 sindrenm <https://github.com/sindrenm>
@@ -376,6 +376,9 @@ declare module "mongoose" {
     /** Passed directly through to tls.createSecureContext. See https://nodejs.org/dist/latest-v9.x/docs/api/tls.html#tls_tls_createsecurecontext_options for more info. */
     ciphers?: string;
     ecdhCurve?: string;
+    
+    /** Flag for using new URL string parser instead of current (deprecated) one */
+    useNewUrlParser?: boolean;
 
     // TODO
     safe?: any;

types/mongoose/mongoose-tests.ts

@@ -28,7 +28,8 @@ const connection2: Promise<mongoose.Mongoose> = mongoose.connect(connectUri, {
     autoIndex: true
   },
   mongos: true,
-  bufferCommands: false
+  bufferCommands: false,
+  useNewUrlParser: true
 });
 const connection3: null = mongoose.connect(connectUri, function (error) {
   error.stack;