Bug demonstration

For prettier-tslint#10

Steps to reproduce

npm install
node_modules/.bin/prettier-tslint check '**/*.ts'

Notes

It fails for me using

1. Linux
2. Node.js v10.9.0

In this project, if I remove the tabWidth option in .prettierrc it doesn't throw for me anymore. Nonetheless in another, more complex project, removing that option still causes some failures for other rules like prefer-const, typedef, ordered-imports.