Update dependencies and devDependencies

* I updated [is-object](https://github.com/ljharb/is-object), [tap-spec](https://github.com/scottcorgan/tap-spec) and [tape](https://github.com/substack/tape).
* I removed [global](https://github.com/Raynos/global) from `devDependencies`.
  * It's already included in `dependencies`.