Chore(release): Prepare for v3.9.1 release (#349)

* chore(release): Preparing for 3.9.1 release

* Bump version to 3.9.1.

* Update changelog to reflect impression event fix and PR.

CHANGELOG.md

@@ -1,12 +1,18 @@
 # Optimizely Python SDK Changelog
 
+## 3.9.1
+July 14th, 2021
+
+### Bug Fixes:
+* Fixed issue with serving incorrect variation in projects containing multiple flags with duplicate keys. [#347] (https://github.com/optimizely/python-sdk/pull/347)
+* Fixed issue with serving incorrect variation in create_impression_event in user_event_factory.py. [#350] (https://github.com/optimizely/python-sdk/pull/350)
+
 ## 3.9.0
 June 1st, 2021
 
 ### New Features
 * Added support for multiple concurrent prioritized experiments per flag. [#322](https://github.com/optimizely/python-sdk/pull/322)
 
-
 ## 3.8.0
 February 12th, 2021
 

optimizely/version.py

@@ -11,5 +11,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-version_info = (3, 9, 0)
+version_info = (3, 9, 1)
 __version__ = '.'.join(str(v) for v in version_info)