Update Django version for security vulnerability

See [CVE-2019-3498 Detail](https://nvd.nist.gov/vuln/detail/CVE-2019-3498)
5 years ago · 6f0ffb74c4
1 changed files with 1 additions and 1 deletions
--- a/requirements.txt
+++ b/requirements.txt
@ -1,5 +1,5 @@
 dj-database-url==0.5.0
 Django==2.1.2
 Django==2.1.5
 django-filter==2.0.0
 django-heroku==0.3.1
 django-widget-tweaks==1.4.2