Same imports; code style

Signed-off-by: CapsLock <faimaison@legeox.net>

coin/billing/admin.py

@@ -6,7 +6,6 @@ from django.contrib import messages
 from django.http import HttpResponseRedirect
 from django.conf.urls import url
 from django.contrib.admin.util import flatten_fieldsets
-from django.core.urlresolvers import reverse
 
 from coin.filtering_queryset import LimitedAdminInlineMixin
 from coin.billing.models import Invoice, InvoiceDetail, Payment
@@ -155,7 +154,8 @@ class InvoiceAdmin(admin.ModelAdmin):
                 request, 'Vous n\'avez pas l\'autorisation de valider '
                          'une facture.')
 
-        return HttpResponseRedirect(reverse('admin:billing_invoice_change', args=(id,)))
+        return HttpResponseRedirect(reverse('admin:billing_invoice_change',
+                                            args=(id,)))
 
 
 admin.site.register(Invoice, InvoiceAdmin)