tests: force string URL in widget tests (required for mechanize≥0.4.5)

tests/test_widgets.py

@@ -36,7 +36,7 @@ class MockHtmlForm(object):
         form = Form(method='post', use_tokens=False, enctype='application/x-www-form-urlencoded')
         form.widgets.append(widget)
         self.as_html = str(form.render())
-        response = mechanize._response.test_html_response(self.as_html, headers=[])
+        response = mechanize._response.test_html_response(self.as_html, headers=[], url='')
         factory = mechanize.Browser()
         factory.set_response(response)
         self.factory = factory

tox.ini

@@ -22,7 +22,7 @@ deps =
     pytest-cov
     pytest-django
     WebTest
-    mechanize!=0.4.5
+    mechanize
     gadjo
     pyquery
     mock