Add Bhutan holidays (#2635)

Signed-off-by: Aneesh Angane <[email protected]>
Signed-off-by: Prateekshit Jaiswal <[email protected]>
Co-authored-by: Aneesh <[email protected]>
Co-authored-by: Aneesh Angane <[email protected]>
Co-authored-by: ~Jhellico <[email protected]>
Co-authored-by: Arkadii Yakovets <[email protected]>
Co-authored-by: Prateekshit <[email protected]>
Co-authored-by: ~Jhellico <[email protected]>
Co-authored-by: Arkadii Yakovets <[email protected]>

Author: 5 people

CONTRIBUTORS

@@ -11,6 +11,7 @@ Alexei Mikhailov
 Anders Wenhaug
 Andrei Klimenko
 Andres Marrugo
+Aneesh Angane
 Ankush Kapoor
 Anon Kangpanich
 Anthony Rose

README.md

@@ -105,7 +105,7 @@ and detailed information.
 
 ## Available Countries
 
-We currently support 225 country codes. The standard way to refer to a country is by using its [ISO
+We currently support 226 country codes. The standard way to refer to a country is by using its [ISO
 3166-1 alpha-2 code](https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes), the same used
 for domain names, and for a subdivision its [ISO 3166-2
 code](https://en.wikipedia.org/wiki/ISO_3166-2). Some countries have common or foreign names or
@@ -315,6 +315,13 @@ any) in brackets, available languages and additional holiday categories. All cou
 <td></td>
 </tr>
 <tr>
+<td>Bhutan</td>
+<td>BT</td>
+<td>Administrative Subdivisions: 11 (Paro), 12 (Chhukha), 13 (Haa), 14 (Samtse), 15 (Thimphu), 21 (Tsirang), 22 (Dagana), 23 (Punakha), 24 (Wangdue Phodrang), 31 (Sarpang), 32 (Trongsa), 33 (Bumthang), 34 (Zhemgang), 41 (Trashigang), 42 (Monggar), 43 (Pema Gatshel), 44 (Lhuentse), 45 (Samdrup Jongkhar), GA (Gasa), TY (Trashi Yangtse)</td>
+<td></td>
+<td></td>
+</tr>
+<tr>
 <td>Bolivia</td>
 <td>BO</td>
 <td>Departments: B (El Beni), C (Cochabamba), H (Chuquisaca), L (La Paz), N (Pando), O (Oruro), P (Potosí), S (Santa Cruz), T (Tarija)</td>

holidays/calendars/__init__.py

@@ -26,3 +26,4 @@
 from holidays.calendars.persian import _Persian
 from holidays.calendars.sinhala import _SinhalaLunar, _CustomSinhalaHolidays
 from holidays.calendars.thai import _ThaiLunisolar, KHMER_CALENDAR, THAI_CALENDAR
+from holidays.calendars.tibetan import _TibetanLunisolar, _CustomTibetanHolidays