Bump django from 2.2.3 to 2.2.4

Created by: dependabot[bot]

Bumps django from 2.2.3 to 2.2.4.

Commits

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

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