Re-add some deprecation warning filters

Turns out there never was a PyPEG2 release...

qutebrowser/misc/earlyinit.py

@@ -199,7 +199,17 @@ def _check_modules(modules):
 
     for name, text in modules.items():
         try:
-            importlib.import_module(name)
+            # https://bitbucket.org/fdik/pypeg/commits/dd15ca462b532019c0a3be1d39b8ee2f3fa32f4e
+            # pylint: disable=bad-continuation
+            with log.ignore_py_warnings(
+                category=DeprecationWarning,
+                message=r'invalid escape sequence'
+            ), log.ignore_py_warnings(
+                category=ImportWarning,
+                message=r'Not importing directory .*: missing __init__'
+            ):
+                # pylint: enable=bad-continuation
+                importlib.import_module(name)
         except ImportError as e:
             _die(text, e)