test: remove duplicate variable

[kenany]

No description provided.

[othiym23]

Not only is this a good find, this is a strong signal that we should probably standardify read-package-json, because a linter totes would have caught this. ❤️, @kenany!

[kenany]

@othiym23 Oooh that would be nice! Looks like standard is already in use but the version this repo uses doesn't catch it. I'll send a PR to update to standard@^5.3.1 so that we would get this next time:

$ npm t

> read-package-json@2.0.1 test /home/kenan/Code/forks/read-package-json
> standard && tap test/*.js

standard: Use JavaScript Standard Style (https://github.com/feross/standard) 
  /home/kenan/Code/forks/read-package-json/test/readmes.js:9:5: "expect" is already defined
npm ERR! Test failed.  See above for more details.

[othiym23]

Landed as 32c86e5. Thanks, Kenan!