chore(publish): ensure build is done before publishing

Author: samuel-olivier

package.json

@@ -5,6 +5,7 @@
   "description": "Enhanced Monaco editor with TextMate grammars and more",
   "scripts": {
     "build": "rollup --config rollup.config.ts --configPlugin typescript && npm run generate-types",
+    "prepublishOnly": "npm run build",
     "generate-types": "tsc --project tsconfig.types.json",
     "update-extensions": "ts-node update-extensions.ts"
   },
@@ -83,4 +84,4 @@
     "not IE 11",
     "not IE_Mob 11"
   ]
-}
+}