fix: fix incorrect package exports, close #135

Author: pengzhanbo

vite-plugin-mock-dev-server/package.json

@@ -20,26 +20,26 @@
   "exports": {
     ".": {
       "import": {
-        "types": "./dist/index.d.ts",
-        "default": "./dist/index.js"
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
       }
     },
     "./helper": {
       "import": {
-        "types": "./dist/helper.d.ts",
-        "default": "./dist/helper.js"
+        "types": "./dist/helper.d.mts",
+        "default": "./dist/helper.mjs"
       }
     },
     "./server": {
       "import": {
-        "types": "./dist/server.d.ts",
-        "default": "./dist/server.js"
+        "types": "./dist/server.d.mts",
+        "default": "./dist/server.mjs"
       }
     },
     "./package.json": "./package.json"
   },
-  "main": "dist/index.js",
-  "types": "dist/index.d.ts",
+  "main": "dist/index.mjs",
+  "types": "dist/index.d.mts",
   "files": [
     "dist"
   ],