Update PyPI api URL.

Flask 1.0 is out, pip made breaking changes, warehouse is a thing, new
requests soon. So
much fun in python world lately.

qutebrowser/misc/autoupdate.py

@@ -45,7 +45,7 @@ class PyPIVersionClient(QObject):
                arg: The error message, as string.
     """
 
-    API_URL = 'https://pypi.python.org/pypi/{}/json'
+    API_URL = 'https://pypi.org/pypi/{}/json'
     success = pyqtSignal(str)
     error = pyqtSignal(str)
 

tests/unit/misc/test_autoupdate.py

@@ -67,7 +67,7 @@ def test_get_version_success(qtbot):
         with qtbot.waitSignal(client.success):
             client.get_version('test')
 
-    assert http_stub.url == QUrl('https://pypi.python.org/pypi/test/json')
+    assert http_stub.url == QUrl(client.API_URL.format('test'))
 
 
 def test_get_version_error(qtbot):