add CH to allowed holidays, fix year

lib/holidays.js

@@ -32,7 +32,7 @@ const variableOffsets = {
 const holidayCache = {};
 function getDateHolidays(countryCode) {
   if (!(countryCode in holidayCache)) {
-    holidayCache[countryCode] = new DateHolidays(countryCode).getHolidays(2022);
+    holidayCache[countryCode] = new DateHolidays(countryCode).getHolidays(2023);
   }
 
   return holidayCache[countryCode];
@@ -151,7 +151,7 @@ function Holidays(year) {
   }
 
   this.getAllHolidays = function (info, epochSpan, cb) {
-    if (info.countryCode && ['DE', 'AT', 'GB', 'US'].includes(info.countryCode)) {
+    if (info.countryCode && ['DE', 'AT', 'GB', 'US', 'CH', 'IT', 'LU', 'TZ'].includes(info.countryCode)) {
       const holidayDays = getDateHolidays(info.countryCode)
         .filter(x => x.type === 'public')
         .map(x => {