chore: changelog

Author: samuelscheit

CHANGELOG.md

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+## v1.3.0
+
+
+### 🚀 Enhancements
+
+  - **date:** Added setTimezone function (1947264)
+  - **date:** Added isInPast function (63a51e3)
+  - Setup eslint (e06de12)
+  - **chore:** License and readme improvements (abf11f7)
+  - Docs + CI/CD (9bab437)
+
+### 🔥 Performance
+
+  - **Array.flat:** Use push(...) instead of concat (4341d22)
+
+### 🩹 Fixes
+
+  - **chore:** Removed .vscode & dist folder (ec33f88)
+  - Cleaned up package json (c819cf3)
+  - CI/CD (e99a90f)
+  - CI/CD (40e089e)
+
+### 💅 Refactors
+
+  - **package:** Switched package manager to yarn (5912e1a)
+  - New documentation & formatting rules (#21)
+
+### ❤️  Contributors
+
+- Samuel 
+- Xnacly 
+- Conner Bachmann <[email protected]>
+