Django-mjml

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* Added supporting Django 5.1
* Added MJML 4.15.2 in tests
* Removed MJML 4.6.3 from tests
* Updated github-actions

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* Added Python 3.12 in tests
* Added supporting Django 5.0

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* Added Python 3.11 in tests
* Added supporting Django 4.2
* Added MJML 4.14 in tests
* Updated README

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* Stopped supporting Python 2.7
* Stopped supporting Django 1.8, 1.9, 1.10, 1.11, 2.0 and 2.1
* Removed MJML 4.5 from tests
* Added MJML 4.12 and 4.13 in tests
* Moved MJML TCP-Server into separated repo https://github.com/danihodovic/mjml-server
* Renamed base branch `master` to `main`

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* Added supporting Django 4.0
* Upgraded MJML to 4.11.0 in dockerfile
* Added Python 3.10 in tests
* Added MJML 4.11.0 in tests
* Removed MJML 4.4.0 from tests

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* Added supporting Django v3.2
* Added Python 3.9 in tests
* Added MJML 4.10.1 in tests
* Removed Python 3.5 from tests
* Removed MJML older than 4.4.0 from tests
* Upgraded Node to v14 for tcp-server
* Upgraded MJML to 4.9.3 in dockerfile
* Moved from Travis to GitHub Actions