Bump serialize-javascript and rollup-plugin-terser (#206)

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 4.0.0 and updates ancestor dependency [rollup-plugin-terser](https://github.com/TrySound/rollup-plugin-terser). These dependencies need to be updated together.


Updates `serialize-javascript` from 2.1.2 to 4.0.0
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v2.1.2...v4.0.0)

Updates `rollup-plugin-terser` from 5.3.0 to 5.3.1
- [Release notes](https://github.com/TrySound/rollup-plugin-terser/releases)
- [Commits](TrySound/rollup-plugin-terser@v5.3.0...v5.3.1)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-type: indirect
- dependency-name: rollup-plugin-terser
  dependency-type: direct:development
...

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Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "marked": "0.8.2",
     "rimraf": "^3.0.2",
     "rollup": "2.3.2",
-    "rollup-plugin-terser": "5.3.0",
+    "rollup-plugin-terser": "5.3.1",
     "statikk": "^2.1.1"
   },
   "scripts": {