DOC: added note about FixedOffsetTimezone

Author: Chang She

RELEASE.rst

@@ -176,6 +176,8 @@ pandas 0.9.0
   - Fill boolean DataFrame with NaN when calling shift (#1814)
   - Fix setuptools bug causing pip not to Cythonize .pyx files sometimes
   - Fix negative integer indexing regression in .ix from 0.7.x (#1888)
+  - Fix error while retrieving timezone and utc offset from subclasses of
+    datetime.tzinfo without .zone and ._utcoffset attributes (#1922)
 
 pandas 0.8.1
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