Fix aggreate type convert

Author: manyuanrong

README.md

@@ -17,7 +17,7 @@
 ## Examples
 
 ```ts
-import { init, MongoClient } from "https://deno.land/x/mongo@v0.5.0/mod.ts";
+import { init, MongoClient } from "https://deno.land/x/mongo@v0.5.1/mod.ts";
 
 // Initialize the plugin
 await init();

mod.ts

@@ -4,5 +4,5 @@ export * from "./ts/database.ts";
 export * from "./ts/result.ts";
 export { ObjectId } from "./ts/types.ts";
 export * from "./ts/util.ts";
-export const VERSION = "v0.5.0";
+export const VERSION = "v0.5.1";
 export const RELEASE_URL = `https://github.com/manyuanrong/deno_mongo/releases/download/${VERSION}`;

ts/collection.ts

@@ -1,8 +1,8 @@
 import { MongoClient } from "./client.ts";
 import { UpdateResult } from "./result.ts";
 import { CommandType, FindOptions } from "./types.ts";
+import { convert, parse } from "./type_convert.ts";
 import { dispatchAsync, encode } from "./util.ts";
-import { parse, convert } from "./type_convert.ts";
 
 export class Collection {
   constructor(
@@ -162,7 +162,7 @@ export class Collection {
         })
       )
     );
-    return docs as T[];
+    return parse(docs) as T[];
   }
 
   public async createIndexes(