Add Erev YK holiday description which includes mention of Kol Nidre

Author: mjradwin

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hebcal/rest-api",
-  "version": "6.1.6",
+  "version": "6.1.7",
   "author": "Michael J. Radwin (https://github.com/mjradwin)",
   "keywords": [
     "hebcal"

src/holidays.json

@@ -5,6 +5,7 @@
 "Chag HaBanot": "North African Chanukah festival of daughters. Called Eid al-Banat in Arabic, the holiday was most preserved in Tunisia",
 "Chanukah": "Hanukkah, the Jewish festival of rededication. Also known as the Festival of Lights, the eight-day festival is observed by lighting the candles of a hanukkiah (menorah)",
 "Days of the Omer": "7 weeks from the second night of Pesach to the day before Shavuot. Also called Sefirat HaOmer, it is a practice that consists of a verbal counting of each of the forty-nine days between the two holidays",
+"Erev Yom Kippur": "Evening of Yom Kippur (Day of Atonement), which includes the Kol Nidre service",
 "Family Day": "Yom HaMishpacha, a day to honor the family unit",
 "Hebrew Language Day": "Promotes the Hebrew language in Israel and around the world. Occurs on the birthday of Eliezer Ben Yehuda, the father of modern spoken Hebrew",
 "Herzl Day": "Commemorates the life and vision of Zionist leader Theodor Herzl",

test/common.spec.js

@@ -340,6 +340,12 @@ test('getHolidayDescription-ykk', () => {
   expect(s).toBe('Minor day of atonement occurring monthly on the day preceeding each Rosh Chodesh');
 });
 
+test('getHolidayDescription-erev-ykk', () => {
+  const ev = new HolidayEvent(new HDate(9, 'Tishrei', 5786), 'Erev Yom Kippur', flags.LIGHT_CANDLES | flags.EREV);
+  const s = getHolidayDescription(ev);
+  expect(s).toBe('Evening of Yom Kippur (Day of Atonement), which includes the Kol Nidre service');
+});
+
 test('getHolidayDescription Shabbat Mevarchim Chodesh', () => {
   const ev = new HolidayEvent(new HDate(25, 'Adar I', 5782),
       'Shabbat Mevarchim Chodesh Adar II', flags.SHABBAT_MEVARCHIM);