build：更改chat配置

Author: nianyi778

package.json

@@ -1,6 +1,6 @@
 {
   "name": "spark-ai-browser",
-  "version": "0.1.6",
+  "version": "0.1.7",
   "author": {
     "name": "nianyi",
     "email": "[email protected]",

src/index.ts

@@ -206,7 +206,8 @@ export class Spark {
         chat: {
           domain: this.option.modelDomain,
           temperature: 0.5,
-          max_tokens: 1024,
+          max_tokens: 2048,
+          top_k: 4,
         },
       },
       payload: payload || {