[skip ci] Add release notes for version 0.7.0

.chglog/0.7.0.md

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+## ⭐ Enhancements
+
+- Add easter sunday in hessen [#88](https://github.com/focus-shift/jollyday/pull/88)
+- Add german holiday tests for 2022 and 2023 and improve 2010 [#86](https://github.com/focus-shift/jollyday/pull/86)
+- Add germans 'Day of Repentance and Prayer' before 1995 [#89](https://github.com/focus-shift/jollyday/issues/89)
+- Add missing Juneteenth for the united states [#81](https://github.com/focus-shift/jollyday/issues/81)
+- Improve AL tests [#84](https://github.com/focus-shift/jollyday/pull/84)
+- Improve tests for GB [#83](https://github.com/focus-shift/jollyday/pull/83)
+
+## 🐞 Bugs
+
+- Fix package of xml util test [#85](https://github.com/focus-shift/jollyday/pull/85)
+
+## ❤️ Contributors
+
+We'd like to thank all the contributors who worked on this release!
+
+- [@derTobsch](https://github.com/derTobsch)