build(deps-dev): bump typedoc from 0.19.0 to 0.20.29

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.19.0 to 0.20.29.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](https://github.com/TypeStrong/TypeDoc/compare/v0.19.0...v0.20.29)

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

package.json

@@ -90,7 +90,7 @@
     "ts-node": "^9.0.0",
     "tslint": "^6.1.3",
     "tslint-immutable": "^6.0.1",
-    "typedoc": "^0.19.0",
+    "typedoc": "^0.20.29",
     "typescript": "4.2.2",
     "webpack": "^3.10.0"
   },