Update django requirement from <2.3,>=1.11 to >=1.11,<3.1

[dependabot-preview[bot]]

Updates the requirements on django to permit the latest version.

Commits

- [`d36413a`](https://github.com/django/django/commit/d36413a2eb5678dda35559a48769703acd784898) [3.0.x] Bumped version for 3.0 release. - [`f3da083`](https://github.com/django/django/commit/f3da0836ff3a26c6fe420eeef336d52c22c8ead7) [3.0.x] Finalized release notes for Django 3.0. - [`d13ba55`](https://github.com/django/django/commit/d13ba5502dac69403651a686949ee60db8db56db) [3.0.x] Added CVE-2019-19118 to the security archive. - [`4afa0e5`](https://github.com/django/django/commit/4afa0e5d2a7c723a11d06434706810224651c50b) [3.0.x] Updated contrib translations from Transifex - [`71ec953`](https://github.com/django/django/commit/71ec95345cdc8039c8e7089977580f7e1cd39436) [3.0.x] Updated core translations from Transifex - [`5fca551`](https://github.com/django/django/commit/5fca551f1264d583e41477d1e1d9edae10ea6890) [3.0.x] Removed issue reporter name from 2.1.15 and 2.2.8 release notes. - [`46491e8`](https://github.com/django/django/commit/46491e8095b84623e1f3734569335dd68d89504f) [3.0.x] Added release dates for 2.1.15, 2.2.8 and 3.0. - [`092cd66`](https://github.com/django/django/commit/092cd66cf3c3e175acce698d6ca2012068d878fa) Fixed CVE-2019-19118 -- Required edit permissions on parent model for editabl... - [`db0cc4a`](https://github.com/django/django/commit/db0cc4ae96c4752d10d98a3c7f2c48f813bf8a7f) [3.0.x] Refs [#30953](https://github-redirect.dependabot.com/django/django/issues/30953) -- Added 2.1.15 release note for 0107e3d1058f653f66032f7f... - [`f4ed680`](https://github.com/django/django/commit/f4ed6800bd5de576816861931699ddd8377d338d) [3.0.x] Fixed [#30953](https://github-redirect.dependabot.com/django/django/issues/30953) -- Made select_for_update() lock queryset's model when u... - Additional commits viewable in [compare view](https://github.com/django/django/compare/1.11...3.0)

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[codecov[bot]]

Codecov Report

Merging #79 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #79   +/-   ##
=======================================
  Coverage   64.73%   64.73%           
=======================================
  Files          28       28           
  Lines        1401     1401           
=======================================
  Hits          907      907           
  Misses        494      494

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[solarissmoke]

@dependabot ignore this major version

[dependabot-preview[bot]]

OK, I won't notify you about version 3.x.x again, unless you re-open this PR or update to a 3.x.x release yourself.