Bumped the minimum version requirement on django-simple-history; HistoricalChanges which we now use was introduced with 2.3.0.

 - Legacy-Id: 15834

Author: levkowetz

requirements.txt

@@ -17,7 +17,7 @@ django-cors-headers>=2.4.0
 django-formtools>=1.0		# instead of django.contrib.formtools in 1.8
 django-markup>=1.1
 django-password-strength>=1.2.1
-django-simple-history>=2.0
+django-simple-history>=2.3.0
 django-tastypie>=0.13.2
 django-widget-tweaks>=1.3
 docutils>=0.12