Parsing error: Unexpected token => with Linter(Travis CI)

Question

I have this code, but Travis CI keeps denying it when I push up to GitHub because of the =>, but I am not sure how to rewrite it so it will pass. Also, I do have es6 listed as true in my linter file

 bcrypt.compare(password, hash, err, pwMatches) => {
     console.log("I'm the password manager", pwMatches);
 }