Update changelog with buffer protocol changes

Author: rhpvorderman

CHANGELOG.rst

@@ -12,8 +12,9 @@ version 1.4.0-dev
 + The internal ``igzip._IGzipReader`` has been rewritten in C. As a result the
   overhead of decompressing files has significantly been reduced and
   ``python -m isal.igzip`` is now very close to the C ``igzip`` application.
-+ The ``igzip._IGZipReader`` in C is now used in ``igzip.decompress``. This
-  has reduced overhead significantly.
++ The ``igzip._IGZipReader`` in C is now used in ``igzip.decompress``. The
+  ``_GzipReader`` also can read from objects that support the buffer protocol
+  This has reduced overhead significantly.
 
 version 1.3.0
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