[doc] Add ChangeLog

Author: Samuel Hassine

CHANGELOG.md

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+# Changelog
+
+## Version 4.2.0 (11/02/2021)
+*No changelog for this release.*
+
+---
+
+## Version 4.1.2 (03/02/2021)
+*No changelog for this release.*
+
+---
+
+## Version 4.1.1 (01/02/2021)
+*No changelog for this release.*
+
+---
+
+## Version 4.1.0 (01/02/2021)
+
+#### Bug Fixes:
+
+- [#134](https://github.com/OpenCTI-Platform/client-python/issues/134) Export of STIX relationships is not filling the attribute "type" properly
+
+---
+
+## Version 4.0.7 (14/01/2021)
+*No changelog for this release.*
+
+---
+
+## Version 4.0.6 (11/01/2021)
+*No changelog for this release.*
+
+---
+
+## Version 4.0.5 (07/01/2021)
+
+#### Bug Fixes:
+
+- [#132](https://github.com/OpenCTI-Platform/client-python/issues/132) upload_file not working as expected
+
+---
+
+## Version 4.0.3 (31/12/2020)
+*No changelog for this release.*
+---
+
+## Version 4.0.4 (31/12/2020)
+*No changelog for this release.*
+---
+
+## Version 4.0.2 (17/12/2020)
+*No changelog for this release.*
+
+---
+
+## Version 4.0.1 (16/12/2020)
+*No changelog for this release.*
+
+---
+
+## Version 4.0.0 (15/12/2020)
+
+#### Enhancements:
+
+- [#123](https://github.com/OpenCTI-Platform/client-python/issues/123) Add an option to remove orphan from a Stix bundle (default true)
+- [#112](https://github.com/OpenCTI-Platform/client-python/issues/112) External references edition
+- [#111](https://github.com/OpenCTI-Platform/client-python/issues/111) No tool_version in tool
+- [#105](https://github.com/OpenCTI-Platform/client-python/issues/105) Migration to V4
+- [#102](https://github.com/OpenCTI-Platform/client-python/issues/102) Support of http(s) proxies
+- [#97](https://github.com/OpenCTI-Platform/client-python/issues/97) Possibility to set or modify the Reliability of an Organization
+- [#82](https://github.com/OpenCTI-Platform/client-python/issues/82) STIX bundle import - Indicator label is not imported 
+- [#36](https://github.com/OpenCTI-Platform/client-python/issues/36) Add state management in connector helpers
+
+#### Bug Fixes:
+
+- [#114](https://github.com/OpenCTI-Platform/client-python/issues/114) Wrong import inside worker
+- [#110](https://github.com/OpenCTI-Platform/client-python/issues/110) Observables Import Fails
+- [#107](https://github.com/OpenCTI-Platform/client-python/issues/107) STIX bundle import does not associate malware with kill chain phases
+- [#100](https://github.com/OpenCTI-Platform/client-python/issues/100) Unable to localize user in a region, country or city
+
+---
+
+## Version 3.3.3 (23/06/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.3.2 (04/06/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.3.1 (03/06/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.3.0 (27/05/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.2.7 (20/05/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.2.6 (15/05/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.2.5 (14/05/2020)
+
+#### Enhancements:
+
+- [#91](https://github.com/OpenCTI-Platform/client-python/issues/91) Add support for x_opencti_organization_class
+
+---
+
+## Version 3.2.4 (05/05/2020)
+
+#### Enhancements:
+
+- [#80](https://github.com/OpenCTI-Platform/client-python/issues/80) Pass tags at the creation of entities
+
+---
+
+## Version 3.2.3 (30/04/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.2.2 (30/04/2020)
+
+#### Enhancements:
+
+- [#69](https://github.com/OpenCTI-Platform/client-python/issues/69) Possibility to set the score of an indicator at the creation 
+
+---
+
+## Version 3.2.1 (30/04/2020)
+
+#### Bug Fixes:
+
+- [#79](https://github.com/OpenCTI-Platform/client-python/issues/79) Exporting entities containing observables is broken
+
+---
+
+## Version 3.2.0 (27/04/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.1.2 (27/04/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.1.1 (27/04/2020)
+
+#### Enhancements:
+
+- [#73](https://github.com/OpenCTI-Platform/client-python/issues/73) Introduce notes & opinions
+
+---
+
+## Version 3.1.0 (01/04/2020)
+
+#### Bug Fixes:
+
+- [#68](https://github.com/OpenCTI-Platform/client-python/issues/68) opencti connector - reports with incoherent dates
+- [#66](https://github.com/OpenCTI-Platform/client-python/issues/66) Some report dates are in the future on MITRE report creation/ingestion 
+
+---
+
+## Version 3.0.3 (09/03/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.0.2 (23/02/2020)
+*No changelog for this release.*
+
+---
+
+## Version 3.0.1 (20/02/2020)
+*No changelog for this release.*