Fix demo build error again /2

Fixes #57 permanently

Author: fregante

package-lock.json

@@ -89,11 +89,11 @@
 		"jsdom": "^16.4.0",
 		"npm-run-all": "^4.1.5",
 		"parcel-bundler": "^1.12.4",
-		"parcel-plugin-svelte": "^4.0.6",
+		"parcel-plugin-svelte": "^4.0.8",
 		"rollup": "^2.36.1",
 		"rollup-plugin-terser": "^7.0.2",
 		"strip-indent": "^3.0.0",
-		"svelte": "3.29.0",
+		"svelte": "^3.31.2",
 		"svelte-check": "^1.1.26",
 		"ts-node": "^9.1.1",
 		"tslib": "^2.1.0",