message: fix(typegoose): buildSchema: fix return type
diff: @@ -119,14 +119,14 @@ export function buildSchema<U extends AnyParamConstructor<any>>(
  cl: U,
  options?: mongoose.SchemaOptions,
  overwriteOptions?: IModelOptions
  -): mongoose.Schema<DocumentType<U>> {
  +): mongoose.Schema<DocumentType<InstanceType<U>>> {
  assertionIsClass(cl);
  logger.debug('buildSchema called for "%s"', getName(cl, overwriteOptions));
  const mergedOptions = mergeSchemaOptions(options, cl);
  - let sch: mongoose.Schema<DocumentType<U>> | undefined = undefined;
  + let sch: mongoose.Schema<DocumentType<InstanceType<U>>> | undefined = undefined;
  /** Parent Constructor */
  let parentCtor = Object.getPrototypeOf(cl.prototype).constructor;
  // iterate trough all parents
  