issue #211 forgotten changelog update

Author: maxtepkeev

CHANGELOG.rst

@@ -1,6 +1,14 @@
 Changelog
 ---------
 
+2.1.2 (2019-XX-XX)
+++++++++++++++++++
+
+**Bugfixes**:
+
+- ``session()`` doesn't restore previous engine if fails (`Issue #211 <https://github.com/maxtepkeev/
+  python-redmine/issues/211>`__) (thanks to `Dmitry Logvinenko <https://github.com/dm-logv>`__)
+
 2.1.1 (2018-05-02)
 ++++++++++++++++++
 

redminelib/__init__.py

@@ -76,6 +76,7 @@ def session(self, **options):
         engine = self.engine
         self.engine = engine.__class__(
             requests=utilities.merge_dicts(engine.requests, options.pop('requests', {})), **options)
+
         try:
             yield self
         except exceptions.BaseRedmineError as e: