优化导出逻辑

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vxe-table-plugin-export",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "基于 vxe-table 表格的增强插件，支持导出 xlsx 等格式",
   "scripts": {
     "lib": "gulp build"
@@ -34,7 +34,6 @@
     "eslint-plugin-promise": "^4.0.1",
     "eslint-plugin-standard": "^4.0.0",
     "eslint-plugin-typescript": "^0.14.0",
-    "file-saver": "^2.0.2",
     "gulp": "^4.0.2",
     "gulp-autoprefixer": "^6.1.0",
     "gulp-babel": "^8.0.0",