pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

modules/hellobank/perso/transactions.py

@@ -89,5 +89,6 @@ class AccountHistory(Page):
     def get_IBAN(self):
         return self.document.xpath('//a[@class="lien_perso_libelle"]')[0].attrib['id'][10:26]
 
+
 class AccountComing(AccountHistory):
     pass