message: Add "text" to PropOptions
  types(src): add "text" (index option) to PropOptions
  fixes typegoose/typegoose#95
diff: @@ -69,10 +69,16 @@ export interface BasePropOptions {
  index?: boolean;
  /** @link https://docs.mongodb.com/manual/indexes/#sparse-indexes */
  sparse?: boolean;
  - /** when should this property expire?
  + /**
  + * Should this property have an "expires" index?
  * @link https://docs.mongodb.com/manual/tutorial/expire-data
  */
  expires?: string | number;
  + /**
  + * Should this property have an "text" index?
  + * @link https://mongoosejs.com/docs/api.html#schematype_SchemaType-text
  + */
  + text?: boolean;
  /** should subdocuments get their own id?
  * @default true (Implicitly)
  */
  