Addon code alignments

[FinalAngel]

• Extended test matrix
• Added tox and adapted imports
• Adapted code base to align with other supported addons

General

• [x] Update changelog Adapted code base to align with other supported addons
• [x] Add contributors text to README file We're grateful to all contributors who have helped create and maintain this package. Contributors are listed at [link to https://github.com/divio/djangocms-video/graphs/contributors].
• [x] Check that python, django, django-cms and other versions are listed correctly (add badge)
• [x] Make sure Django is not pinned in setup.py
• [x] Align gitignore files
• [x] Align setup.py
• [x] Keep the two line rule

Tests

• [x] Make sure naming for the test files is test_.py
• [x] Add tests_migration.py file if missing
• [x] Remove test migration check in other files
• [x] Check requirements.txt file for accuracy (e.g. unpin djangocms-helper)
• [x] Check settings.py that it is ordered correctly
• [x] Added isort and updated files

Internal

• [x] Run internal checklist

[codecov-io]

Codecov Report

Merging #46 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #46   +/-   ##
=======================================
  Coverage   66.24%   66.24%           
=======================================
  Files           9        9           
  Lines         157      157           
  Branches       28       28           
=======================================
  Hits          104      104           
  Misses         51       51           
  Partials        2        2

Impacted Files	Coverage Δ
djangocms_style/migrations/0007_style_template.py	100% <ø> (ø)	:arrow_up:
djangocms_style/migrations/0003_adapted_fields.py	100% <ø> (ø)	:arrow_up:
...gocms_style/migrations/0006_removed_null_fields.py	100% <ø> (ø)	:arrow_up:
djangocms_style/migrations/0001_initial.py	100% <100%> (ø)	:arrow_up:
...rations/0002_set_related_name_for_cmsplugin_ptr.py	100% <100%> (ø)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e3bbde1...d5a5a22. Read the comment docs.

[codecov-io]

Codecov Report

Merging #46 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #46   +/-   ##
=======================================
  Coverage   66.24%   66.24%           
=======================================
  Files           9        9           
  Lines         157      157           
  Branches       28       28           
=======================================
  Hits          104      104           
  Misses         51       51           
  Partials        2        2

Impacted Files	Coverage Δ
djangocms_style/migrations/0007_style_template.py	100% <ø> (ø)	:arrow_up:
djangocms_style/migrations/0003_adapted_fields.py	100% <ø> (ø)	:arrow_up:
...gocms_style/migrations/0006_removed_null_fields.py	100% <ø> (ø)	:arrow_up:
djangocms_style/migrations/0001_initial.py	100% <100%> (ø)	:arrow_up:
...rations/0002_set_related_name_for_cmsplugin_ptr.py	100% <100%> (ø)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e3bbde1...d5a5a22. Read the comment docs.