Fix croatia

see
https://github.com/nager/Nager.Date/blob/master/src/Nager.Date/PublicHolidays/CroatiaProvider.cs
and svendiedrichsen/jollyday#155

Author: derTobsch

jollyday-holidays/src/main/resources/holidays/Holidays_hr.xml

@@ -6,12 +6,14 @@
     <tns:Fixed month="JANUARY" day="1" descriptionPropertiesKey="NEW_YEAR"/>
     <tns:Fixed month="JANUARY" day="6" descriptionPropertiesKey="EPIPHANY"/>
     <tns:Fixed month="MAY" day="1" descriptionPropertiesKey="LABOUR_DAY"/>
+    <tns:Fixed month="MAY" day="30" descriptionPropertiesKey="NATIONAL_DAY" validFrom="2020"/>
     <tns:Fixed month="JUNE" day="22" descriptionPropertiesKey="ANTI_FACIST"/>
-    <tns:Fixed month="JUNE" day="25" descriptionPropertiesKey="NATIONAL_DAY"/>
+    <tns:Fixed month="JUNE" day="25" descriptionPropertiesKey="NATIONAL_DAY" validFrom="2002" validTo="2019"/>
     <tns:Fixed month="AUGUST" day="5" descriptionPropertiesKey="VICTORY"/>
     <tns:Fixed month="AUGUST" day="15" descriptionPropertiesKey="ASSUMPTION_MARY"/>
-    <tns:Fixed month="OCTOBER" day="8" descriptionPropertiesKey="INDEPENDENCE_DAY"/>
+    <tns:Fixed month="OCTOBER" day="8" descriptionPropertiesKey="INDEPENDENCE_DAY" validTo="2019"/>
     <tns:Fixed month="NOVEMBER" day="1" descriptionPropertiesKey="ALL_SAINTS"/>
+    <tns:Fixed month="NOVEMBER" day="18" descriptionPropertiesKey="MEMORIAL_DAY" validFrom="2020"/>
     <tns:Fixed month="DECEMBER" day="25" descriptionPropertiesKey="CHRISTMAS"/>
     <tns:Fixed month="DECEMBER" day="26" descriptionPropertiesKey="STEPHENS"/>
     <tns:ChristianHoliday type="EASTER" descriptionPropertiesKey="christian.EASTER"/>