message: Document that "type" is required for arrays
  prop(gh-page): document that "type" is required for arrays
  This is a squash merge of typegoose/typegoose#322
diff: @@ -241,6 +241,15 @@ Accepts Type: `any | () => any`
  Overwrite the type that is got from the `design:type` reflection
  +Example: Arrays (array item types can't be automatically inferred via Reflect)
  +
  +```ts
  +class Dummy {
  + @prop({ type: String })
  + public hello: string[];
  +}
  +```
  +
  Example: get as `string[]`, save as `string`
  ```ts
  