docs: add CHANGELOG up to v0.6.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+## [0.6.1](https://github.com/Hugal31/yara-rust/compare/v0.6.0...v0.6.1) (2021-05-06)
+
+### Features
+
+* add 32bit support ([f017299](https://github.com/Hugal31/yara-rust/commit/f0172996af5c28669dc0592526653b95c5bf283e))
+* **yara-sys**: add error message when ([42d7c04](https://github.com/Hugal31/yara-rust/commit/42d7c04b980f5eaf1866d4cff2fc86602fa6ed02))
+
+## [0.6.0](https://github.com/Hugal31/yara-rust/compare/v0.5.0...v0.6.0) (2021-04-27)
+
+### Features
+
+* add libyara v4.1.0 support
+* add process memory scanning ([8d699c3](https://github.com/Hugal31/yara-rust/commit/8d699c313c1cdb084ba9ff545adb103d2cb965e9))
+
+### ⚠ BREAKING CHANGES
+
+* drop support for libyara v3.X.