Edx-api-doc-tools

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* Updated the travis-badge in README.rst to point to travis-ci.com

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* Adding option to include a body parameter in requests.

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* Adding option to specify url patterns for generated docs.

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* Removing caniusepython3 as it is no longer needed since python3 upgrade.

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* Remove support for Django<2.2 and add support for python 3.8

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* Added three new decorators for excluding endpoints from API documentation generation:

* ``exclude_schema``
* ``exclude_schema_for(method_name)``
* ``exclude_all_schemas``