Update publish script

Make sure to build scripts before publishing to registry.

package.json

@@ -39,6 +39,7 @@
     "typescript": "^3.9.7"
   },
   "scripts": {
+    "prepublish": "rm -rf dist/ && rollup -c",
     "test": "jest",
     "build": "rm -rf dist/ && rollup -c",
     "generate": "plop",