[Suggestion] Make SH and PH evaluation optional

[naerymdan]

I have an external set of opening hours that might or might not specify PH/SH. I do not have data for the country in question. I'd rather be able to still get general information form this library than the full stop error "no holiday definition".

Could we have something like:

new opening_hours(
  openingHours,  
  {
    lat: 41.328937, 
    lon: 19.818096,
    address: {
      country_code: "AL",
      state: 'N/A' 
    },
    {
      skip_ph: true,
      skip_sh: true 
    }
  }
);