code: public boolean shouldUpdate(@NonNull String language, @NonNull String unitType, int roundingIncrement) {
      return !this.language.equals(language) || !this.unitType.equals(unitType)
        || !(this.roundingIncrement == roundingIncrement);
    }
docs: Method that can be used to check if an instance of {@link DistanceFormatter}
  needs to be updated based on the passed language / unitType.
  
  @param language to check against the current formatter language
  @param unitType to check against the current formatter unitType
  @return true if new formatter is needed, false otherwise