Refactor to use array include #898
Description
Minor change to make the code more readable. Array.includes is available in Node 6+ and can be used to replace the less-readable [].indexOf !== -1 or [].indexOf > -1.
In general, Array.includes is a drop in replacement but there are some slight differences in edge cases (most notably when searching for undefined).
https://dev.to/adroitcoder/includes-vs-indexof-in-javascript