message: Allow unused expressions
  I use them with Wallaby to log stuff on the fly. Don't fret.
diff: @@ -39,7 +39,7 @@ module.exports = {
  "max-nested-callbacks": ERROR,
  "new-cap": ERROR,
  "no-invalid-this": ERROR,
  - "no-unused-expressions": ERROR,
  + "no-unused-expressions": OFF,
  "consistent-this": OFF,
  "no-control-regex": OFF,
  