Bump typedoc from 0.19.2 to 0.20.25

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.19.2 to 0.20.25.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](TypeStrong/typedoc@v0.19.2...v0.20.25)

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

package.json

@@ -122,7 +122,7 @@
     "tslint": "^6.0.0",
     "tslint-config-prettier": "^1.15.0",
     "tslint-config-standard": "^9.0.0",
-    "typedoc": "^0.19.0",
+    "typedoc": "^0.20.25",
     "typescript": "^4.0.2"
   },
   "husky": {