chore(deps): update dependency typedoc to ^0.12.0 (googleapis#453)

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
  "semver": "^5.5.0"
  },
  "devDependencies": {
- "typedoc": "^0.11.1",
+ "typedoc": "^0.12.0",
  "@types/jws": "^3.1.0",
  "@types/lodash.isstring": "^4.0.3",
  "@types/lru-cache": "^4.1.0",