Bump buble from 0.19.8 to 0.20.0

Bumps [buble](https://github.com/bublejs/buble) from 0.19.8 to 0.20.0.
- [Release notes](https://github.com/bublejs/buble/releases)
- [Changelog](https://github.com/bublejs/buble/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bublejs/buble/compare/v0.19.8...v0.20.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -54,7 +54,7 @@
     "@types/pbf": "^3.0.2",
     "@types/topojson-specification": "^1.0.1",
     "babel-loader": "^8.0.5",
-    "buble": "^0.19.7",
+    "buble": "^0.20.0",
     "buble-loader": "^0.5.1",
     "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "4.3.0",