Merge pull request #549 from Rotzbua/fix_remove_legacy

fix: remove legacy django <1.9 code

constance/admin.py

@@ -2,7 +2,7 @@ from collections import OrderedDict
 from datetime import date, datetime
 from operator import itemgetter
 
-from django import VERSION, forms
+from django import forms
 from django.apps import apps
 from django.contrib import admin, messages
 from django.contrib.admin.options import csrf_protect_m
@@ -113,7 +113,7 @@ class ConstanceAdmin(admin.ModelAdmin):
             opts=self.model._meta,
             form=form,
             media=self.media + form.media,
-            icon_type='gif' if VERSION < (1, 9) else 'svg',
+            icon_type='svg',
         )
         for name, options in settings.CONFIG.items():
             context['config_values'].append(