Add missing superclass init calls.

qutebrowser/utils/qtutils.py

@@ -247,6 +247,7 @@ class PyQIODevice(io.BufferedIOBase):
     # pylint: disable=missing-docstring
 
     def __init__(self, dev):
+        super().__init__()
         self.dev = dev
 
     def __len__(self):

qutebrowser/utils/utils.py

@@ -419,6 +419,7 @@ class FakeIOStream(io.TextIOBase):
     """A fake file-like stream which calls a function for write-calls."""
 
     def __init__(self, write_func):
+        super().__init__()
         self.write = write_func
 
     def flush(self):