message: Fix Doc example, use "string, schema"
  fixes hasezoey#37
diff: @@ -16,6 +16,6 @@ class Kitten {
  }
  const kittenSchema = buildSchema(Kitten);
  -const KittenModel = addModelToTypegoose(mongoose.model(kittenSchema), Kitten);
  +const KittenModel = addModelToTypegoose(mongoose.model('Kitten', kittenSchema), Kitten);
  // "KittenModel" is now a valid Typegoose model
  ```
  