Repository: peopledoc/workalendar (python)

Issue:
Croatia new National Holiday and Independence day moved
Hello,

there were some changes in 2019. for national holidays in Croatia. Holidays listed [here](https://www.officeholidays.com/countries/croatia/2020) are correct. This means that the following changes need to be made:
1. `Statehood day` needs to be moved from Jun 25 to May 30,
2. A new holiday named `Remembrance Day` must be added on Nov 18.

Pull request description:
Introducing the changes in Croatia holidays as of 2020
* Remembrance Day was added,
* Independence Day is no longer a holiday
* Statehood Day date has changed

closes #515


- [x] Tests with a significant number of years to be tested for your calendar.
- [x] Changelog amended with a mention describing your changes. **Note** *Please do NOT change the version number here. It's the project maintainers' duty.*


Sources used to consolidate this calendar:

* https://en.wikipedia.org/wiki/Public_holidays_in_Croatia
* https://www.officeholidays.com/countries/croatia/2020
* https://www.officeholidays.com/countries/croatia/2019


Patch:
diff --git a/Changelog.md b/Changelog.md
index 758b33d..3aa9c2c 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -3,6 +3,7 @@
 ## master (unreleased)
 
 - Bugfix: setting *Consciência Negra day* as a non-holiday by default for Brazilian calendars, thx to @edniemeyer (#516).
+- Bugfix: Introducing the changes in Croatia holidays as of 2020 - Remembrance Day, Independence Day, Statehood Day... thx to @davidpodrebarac for the bug report (#515).
 
 ## v10.1.0 (2020-06-18)
 
diff --git a/workalendar/europe/croatia.py b/workalendar/europe/croatia.py
index 83a7588..f2e1cd6 100644
--- a/workalendar/europe/croatia.py
+++ b/workalendar/europe/croatia.py
@@ -1,3 +1,5 @@
+from datetime import date
+
 from ..core import WesternCalendar, ChristianMixin
 from ..registry_tools import iso_register
 
@@ -9,9 +11,7 @@ class Croatia(WesternCalendar, ChristianMixin):
     FIXED_HOLIDAYS = WesternCalendar.FIXED_HOLIDAYS + (
         (5, 1, "International Workers' Day"),
         (6, 22, "Anti-Fascist Struggle Day"),
-        (6, 25, "Statehood Day"),
         (8, 5, "Victory & Homeland Thanksgiving & Day of Croatian defenders"),
-        (10, 8, "Independence Day"),
     )
 
     include_epiphany = True
@@ -23,3 +23,22 @@ class Croatia(WesternCalendar, ChristianMixin):
     include_christmas = True
     include_boxing_day = True
     boxing_day_label = "St. Stephen's Day"
+
+    def get_fixed_holidays(self, year):
+        days = super().get_fixed_holidays(year)
+
+        if year >= 2020:
+            days.extend([
+                # Statehood date has changed in 2020
+                (date(year, 5, 30), "Statehood Day"),
+                # Remembrance Day has been added in 2020
+                (date(year, 11, 18), "Remembrance Day"),
+            ])
+        else:
+            days.extend([
+                (date(year, 6, 25), "Statehood Day"),
+                # Independance day was a holiday until 2020
+                (date(year, 10, 8), "Independence Day"),
+            ])
+
+        return days


Test patch:
diff --git a/workalendar/tests/test_europe.py b/workalendar/tests/test_europe.py
index 9f7036a..e8e65cc 100644
--- a/workalendar/tests/test_europe.py
+++ b/workalendar/tests/test_europe.py
@@ -239,21 +239,67 @@ class CroatiaTest(GenericCalendarTest):
 
     def test_year_2016(self):
         holidays = self.cal.holidays_set(2016)
-        self.assertIn(date(2016, 1, 1), holidays)   # New Year's Day Nova Godin
-        self.assertIn(date(2016, 1, 6), holidays)   # Epiphany Bogojavljenje,
-        self.assertIn(date(2016, 3, 27), holidays)  # Easter Sunday Uskrs i us
+        self.assertIn(date(2016, 1, 1), holidays)   # New Year's Day
+        self.assertIn(date(2016, 1, 6), holidays)   # Epiphany / Bogojavljenje
+        self.assertIn(date(2016, 3, 27), holidays)  # Easter Sunday
         self.assertIn(date(2016, 3, 28), holidays)  # Easter Monday
-        self.assertIn(date(2016, 5, 1), holidays)   # Intl Workers' Day Međunar
-        self.assertIn(date(2016, 5, 26), holidays)  # Corpus Christi Tijelovo
-        self.assertIn(date(2016, 6, 22), holidays)  # Anti-Fascist Day Dan anti
-        self.assertIn(date(2016, 6, 25), holidays)  # Statehood Day 	Dan drž
+        self.assertIn(date(2016, 5, 1), holidays)   # Intl Workers' Day
+        self.assertIn(date(2016, 5, 26), holidays)  # Corpus Christi / Tijelovo
+        self.assertIn(date(2016, 6, 22), holidays)  # Anti-Fascist Day
+        self.assertIn(date(2016, 6, 25), holidays)  # Statehood Day
         self.assertIn(date(2016, 8, 5), holidays)   # Victory & Homeland Thanks
-        self.assertIn(date(2016, 8, 15), holidays)  # Assumption of Mary 	Vel
+        self.assertIn(date(2016, 8, 15), holidays)  # Assumption of Mary
         self.assertIn(date(2016, 10, 8), holidays)  # Independence Day Dan neov
         self.assertIn(date(2016, 11, 1), holidays)  # All Saints' Day Dan svih
         self.assertIn(date(2016, 12, 25), holidays)  # Christmas Božić
         self.assertIn(date(2016, 12, 26), holidays)  # St. Stephen's Day Prvi d
 
+    def test_year_2020(self):
+        holidays = self.cal.holidays_set(2020)
+        self.assertIn(date(2020, 1, 1), holidays)   # New Year's Day
+        self.assertIn(date(2020, 1, 6), holidays)   # Epiphany / Bogojavljenje
+        self.assertIn(date(2020, 4, 12), holidays)  # Easter Sunday
+        self.assertIn(date(2020, 4, 13), holidays)  # Easter Monday
+        self.assertIn(date(2020, 5, 1), holidays)  # Labour Day
+        self.assertIn(date(2020, 5, 30), holidays)  # Statehood day
+        self.assertIn(date(2020, 6, 11), holidays)  # Corpus Christi
+        self.assertIn(date(2020, 6, 22), holidays)  # Anti-Fascist Day
+        # Victory & Homeland Thanksgiving
+        self.assertIn(date(2020, 8, 5), holidays)
+        self.assertIn(date(2020, 8, 15), holidays)  # Assumption of Mary
+        self.assertIn(date(2020, 11, 1), holidays)  # All Saints' Day
+        self.assertIn(date(2020, 11, 18), holidays)  # Remembrance Day
+        self.assertIn(date(2020, 12, 25), holidays)  # XMas
+        self.assertIn(date(2020, 12, 26), holidays)  # St Stephen
+
+    def test_statehood_day(self):
+        holidays_2019 = self.cal.holidays_set(2019)
+        holidays_2020 = self.cal.holidays_set(2020)
+
+        # Statehood day was a holiday on June 25th until 2020
+        self.assertIn(date(2019, 6, 25), holidays_2019)
+        self.assertNotIn(date(2020, 6, 25), holidays_2020)
+
+        # Statehood day as of 2020 happens on May 30th
+        self.assertNotIn(date(2019, 5, 30), holidays_2019)
+        self.assertIn(date(2020, 5, 30), holidays_2020)
+
+    def test_independance_day(self):
+        # Independence Day was a holiday until 2020
+        holidays_2019 = self.cal.holidays_set(2019)
+        self.assertIn(date(2019, 10, 8), holidays_2019)
+        holidays_2020 = self.cal.holidays_set(2020)
+        self.assertNotIn(date(2020, 10, 8), holidays_2020)
+
+    def test_remembrance_day(self):
+        # Remembrance Day was introduced as of 2020
+        holidays_2018 = self.cal.holidays_set(2018)
+        self.assertNotIn(date(2018, 11, 18), holidays_2018)
+        holidays_2019 = self.cal.holidays_set(2019)
+        self.assertNotIn(date(2019, 11, 18), holidays_2019)
+        holidays_2020 = self.cal.holidays_set(2020)
+        self.assertIn(date(2020, 11, 18), holidays_2020)
+
 
 class Cyprus(GenericCalendarTest):
     cal_class = Cyprus