message: docs(README): remove "as" assertion from example
  this should not be necessary anymore
diff: @@ -37,7 +37,7 @@ const UserModel = getModelForClass(User); // UserModel is a regular Mongoose Mod
  (async () => {
  await mongoose.connect('mongodb://localhost:27017/', { dbName: 'test' });
  - const { _id: id } = await UserModel.create({ name: 'JohnDoe', jobs: ['Cleaner'] } as User); // an "as" assertion, to have types for all properties
  + const { _id: id } = await UserModel.create({ name: 'JohnDoe', jobs: ['Cleaner'] });
  const user = await UserModel.findById(id).exec();
  console.log(user); // prints { _id: 59218f686409d670a97e53e0, name: 'JohnDoe', __v: 0 }
  