chore: rollup configPlugin ts target es6

Author: EqualMa

package.json

@@ -29,7 +29,7 @@
     "lint:fix": "eslint --cache --max-warnings 0 --fix",
     "ensure-linted": "eslint --max-warnings 0 .",
     "semantic-release": "semantic-release",
-    "build": "yarn run clean && rollup -c --configPlugin typescript",
+    "build": "yarn run clean && rollup -c --configPlugin 'typescript={target:`es6`}'",
     "clean": "rimraf dist",
     "prepare": "husky install"
   },