Sync w/external release 0.1.2.  Please see PEP 360 before making changes to external packages.
diff --git a/Lib/wsgiref/headers.py b/Lib/wsgiref/headers.py
index f1ebb03..016eb86 100644
--- a/Lib/wsgiref/headers.py
+++ b/Lib/wsgiref/headers.py
@@ -187,3 +187,19 @@
             else:
                 parts.append(_formatparam(k.replace('_', '-'), v))
         self._headers.append((_name, "; ".join(parts)))
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