[skip ci] Add release notes for version 1.0.0

.chglog/1.0.0.md

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+## ⭐ Enhancements
+
+- 75. Jahrestag des Aufstandes vom 17. Juni 1953 - Germany - Berlin [#670](https://github.com/focus-shift/jollyday/issues/670)
+- sonar: run sonar analyze with jdk 11 [#686](https://github.com/focus-shift/jollyday/pull/686)
+- Switzerland - Mauritius Day missing in Appenzell Innerrhoden [#665](https://github.com/focus-shift/jollyday/pull/665)
+- XML unmarshal: performance improvements - static XMLUtil with static converters [#586](https://github.com/focus-shift/jollyday/pull/586)
+
+## 🐞 Bugs
+
+- Switzerland - all saints adjustments [#675](https://github.com/focus-shift/jollyday/issues/675)
+- Switzerland - Assumption day adjustments [#673](https://github.com/focus-shift/jollyday/issues/673)
+- Switzerland - Easter Monday Adjustments [#679](https://github.com/focus-shift/jollyday/issues/679)
+- Switzerland - Labour day not a public holiday in Aargau [#677](https://github.com/focus-shift/jollyday/issues/677)
+- Switzerland - Peter und Paul ist Observance [#671](https://github.com/focus-shift/jollyday/issues/671)
+
+## 💥 Breaking Changes
+
+- Breaking: Remove deprecated getHolidays(int year, ...) in favour of year as "Year" [#682](https://github.com/focus-shift/jollyday/issues/682)
+- Breaking: Remove unofficial holiday type [#683](https://github.com/focus-shift/jollyday/issues/683)
+
+## ❤️ Contributors
+
+We'd like to thank all the contributors who worked on this release!
+
+- [@derTobsch](https://github.com/derTobsch)
+- [@Sabriahere](https://github.com/Sabriahere)