Correctly define basestring.

Lukasa · Lukasa · commit f36bf09d7193 · 2016-03-29T15:02:22.000+01:00
diff --git a/hyper/tls.py b/hyper/tls.py
@@ -113,7 +113,7 @@ def init_context(cert_path=None, cert=None, cert_password=None):
         try:
             basestring
         except NameError:
-            basestring = str
+            basestring = (str, bytes)
         if not isinstance(cert, basestring):
             context.load_cert_chain(cert[0], cert[1], cert_password)
         else:
