new_contents: from django.contrib import admin
  from simple_history.admin import SimpleHistoryAdmin
  
  from .models import Browser, BrowserVersion
  
  
  class BrowserAdmin(SimpleHistoryAdmin):
      pass
  
  
  class BrowserVersionAdmin(SimpleHistoryAdmin):
      pass
  
  
  admin.site.register(Browser, BrowserAdmin)
  admin.site.register(BrowserVersion, BrowserVersionAdmin)
  
subject: Add Django admin for browsers, browser versions