Add changelog

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+## [1.1.0] - 2021-09-01
+
+### Improvements
+- Docker `HEALTHCHECK`
+  [#129](https://github.com/mormahr/pdf-service/pull/129)
+- Updated Python to v3.9.7
+  [#107](https://github.com/mormahr/pdf-service/pull/107)
+
+### Bug Fixes
+- Fix container shutdown by using `exec` to forward signals
+  [#125](https://github.com/mormahr/pdf-service/pull/125)
+  ([jpxd](https://github.com/jpxd))
+- Fix worker timing out regularly
+  [#124](https://github.com/mormahr/pdf-service/issues/124)
+  [#126](https://github.com/mormahr/pdf-service/pull/126)
+  ([jpxd](https://github.com/jpxd))
+
+## [1.0.0] - 2021-08-19
+
+Initial public release 🎉