docs: add CHANGELOG.md

Author: stepankuzmin

CHANGELOG.md

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+<a name="v0.2.3"></a>
+### v0.2.3 (2021-10-10)
+
+
+#### Bug Fixes
+
+*   skip serializing if Option is None (#6) (h/t @jaspervercnocke) ([149339cd](https://github.com/georust/tilejson/commit/149339cd83d9065800c73174b0db1ec0a3465513))
+
+
+
+<a name="0.2.2"></a>
+### v0.2.2 (2020-09-12)
+
+
+#### Features
+
+*   change type of bounds to f32 instead of i32 (#1) (h/t @jaspervercnocke) ([a7cffa81](https://github.com/georust/tilejson/commit/a7cffa8181accd3268b8ea96ae2668b24ae016a4))
+
+#### Bug Fixes
+
+*   use crate pub ([09f051a9](https://github.com/georust/tilejson/commit/09f051a901bb5648a9bcce05f12c8fdece7b81c9))