Added changelog for 2.9.1
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Jinja2 Changelog
================
+Version 2.9.1
+-------------
+(bugfix release, released on January 7th 2017)
+
+- Resolved a regression with call block scoping for macros. Nested caller
+ blocks that used the same identifiers as outer macros could refer to the
+ wrong variable incorrectly.
+
Version 2.9
-----------
(codename Derivation, released on January 7th 2017)