Add CHANGELOG

Author: MrLightful

CHANGELOG.md

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+## 0.0.2
+
+The release mostly meant to improve project & code quality.
+
+- Clean code
+- Remove unused dependencies
+- Add CHANGELOG
+
+*Breaking change:*
+- Add missing arguments to EMV3DS access token generation (`establishment_code`, `merchant_name`, `mcc`)
+
+## 0.0.1
+
+The first public release of the package.
+It integrates the most basic features of Braspag.
+
+#### Features
+- SDK's core initialization with options
+- Payments integration (`create_sale`, `get_sale`, `capture_sale`, `cancel_sale`)
+- Split Payments integration (`create_split_merchant`)
+- Silent Order Post (SOP) integration (`get_access_token`)
+- EMV3DS integration (`get_access_token`)