chore(package): update rollup-plugin-uglify to version 6.0.3

Closes #4

Author: greenkeeper[bot]

package.json

@@ -7,7 +7,7 @@
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-svelte": "^4.2.1",
-    "rollup-plugin-uglify": "^3.0.0",
+    "rollup-plugin-uglify": "^6.0.3",
     "serve": "^7.2.0",
     "svelte": "^1.64.1"
   },