Fix gregorian typo

README.md

@@ -141,7 +141,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Church Calendar](http://calapi.inadiutorium.cz/) | Catholic liturgical calendar | No | No | Unknown |
 | [Czech Namedays Calendar](http://svatky.adresa.info/) | Lookup for a name and returns nameday date | No | No | Unknown |
 | [Google Calendar](https://developers.google.com/google-apps/calendar/) | Display, create and modify Google calendar events | `OAuth` | Yes | Unknown |
-| [Hebrew Calendar](https://www.hebcal.com/home/developer-apis) | Convert between Gregarian and Hebrew, fetch Shabbat and Holiday times, etc | No | No | Unknown |
+| [Hebrew Calendar](https://www.hebcal.com/home/developer-apis) | Convert between Gregorian and Hebrew, fetch Shabbat and Holiday times, etc | No | No | Unknown |
 | [Holidays](https://holidayapi.com/) | Historical data regarding holidays | `apiKey` | Yes | Unknown |
 | [LectServe](http://www.lectserve.com) | Protestant liturgical calendar | No | No | Unknown |
 | [Nager.Date](https://date.nager.at) | Public holidays for more than 90 countries | No | Yes | No |