Update tsd

`tsd@0.14` reports errors in files within the node_modules folder. This is a known problem solved in tsdjs/tsd#110 and released in `tsd@0.17`. But with that new version, `xo` fails to load `@typescript-eslint/parser`. Using `tsd@0.16` solves all the errors.

package.json

@@ -38,7 +38,7 @@
  ],
  "devDependencies": {
  "ava": "^3.15.0",
- "tsd": "^0.14.0",
+ "tsd": "^0.16.0",
  "xo": "^0.38.2"
  }
 }