Bump django from 2.2.3 to 2.2.4

Bumps django from 2.2.3 to 2.2.4.

Commits

- [`8687fbe`](https://github.com/django/django/commit/8687fbe034ac5eec20e0948b98eb8a2f0b1431a1) [2.2.x] Bumped version for 2.2.4 release. - [`cf694e6`](https://github.com/django/django/commit/cf694e6852b0da7799f8b53f1fb2f7d20cf17534) [2.2.x] Fixed CVE-2019-14235 -- Fixed potential memory exhaustion in django.u... - [`4f5b58f`](https://github.com/django/django/commit/4f5b58f5cd3c57fee9972ab074f8dc6895d8f387) [2.2.x] Fixed CVE-2019-14234 -- Protected JSONField/HStoreField key and index... - [`e34f3c0`](https://github.com/django/django/commit/e34f3c0e9ee5fc9022428fe91640638bafd4cda7) [2.2.x] Fixed CVE-2019-14233 -- Prevented excessive HTMLParser recursion in s... - [`c328971`](https://github.com/django/django/commit/c3289717c6f21a8cf23daff1c78c0c014b94041f) [2.2.X] Fixed CVE-2019-14232 -- Adjusted regex to avoid backtracking issues w... - [`f9462f4`](https://github.com/django/django/commit/f9462f4c82c503fca21fc2af5cb5d6362c36fa83) [2.2.x] Fixed [#30656](https://github-redirect.dependabot.com/django/django/issues/30656) -- Added QuerySet.bulk_update() to the database optimiza... - [`b4139ed`](https://github.com/django/django/commit/b4139ed6eaa430874360a3a98e85bd2c91e19bc7) [2.2.x] Refs [#30656](https://github-redirect.dependabot.com/django/django/issues/30656) -- Reorganized bulk methods in the database optimization ... - [`ea57c8a`](https://github.com/django/django/commit/ea57c8a345c73d17d5ac3a504d8f1c1bd47a7572) [2.2.x] Added stub release notes for security releases. - [`4d6449e`](https://github.com/django/django/commit/4d6449e1258c88b6e4e1ccbb5e84b210371598d2) [2.2.x] Fixed [#30647](https://github-redirect.dependabot.com/django/django/issues/30647) -- Fixed crash of autoreloader when extra directory cann... - [`61d4a15`](https://github.com/django/django/commit/61d4a159899358e3570dfc5db039651325b30992) [2.2.x] Fixed typo in docs/topics/http/sessions.txt. - Additional commits viewable in [compare view](https://github.com/django/django/compare/2.2.3...2.2.4)

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bbengfort / ledger

Bump django from 2.2.3 to 2.2.4 #52