stability improvement

spec/acceptance_steps/suppliers/settings_steps.rb

@@ -1,9 +1,10 @@
 step "I provide a new supplier email address" do
-  find('#supplier_email').set 'new-supplier-mail@qwaiter.com'
+  find('.supplier-email').set 'new-supplier-mail@qwaiter.com'
 end
 
 step "the supplier submits the supplier settings form" do
   find('.submit-supplier-settings').click
+  sleep 1 # give application some time
 end
 
 step "the supplier email should not have been changed" do