support python 3.8 and upgraded to django3

• python 8
• django3
• update other dependencies

Security update

Bump django from 2.2.18 to 2.2.20

Bumps [django](https://github.com/django/django) from 2.2.18 to 2.2.20.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.18...2.2.20)

Signed-off-by: dependabot[bot] <support@github.com>

Security Update

update to django == 2.1.11

security update

Security Patch.

v1.2.19

security patch.

Bumps django from 2.1.7 to 2.1.9.

Security patch.

DRF XSS Vulnerability patch

more info:

encode/django-rest-framework@75a4891

capability to publish selected localized strings

v1.2.16

close #51 action for publishing selected localized strings.

Security update

details: https://github.com/michaelhenry/Localizr/network/alert/requirements.txt/django/open

only export (to ios and android) those LocalizedString that has published status.

v1.2.14

export to ios and android only the localizedstring that has status ==…

Fixed 500 on csv export

v1.2.13

fixed 500 issue on csv export