chore(release): Preparing for 3.5.1 release (#286)

Author: aliabbasrizvi

Diff for: CHANGELOG.md

@@ -1,5 +1,11 @@
 # Optimizely Python SDK Changelog
 
+## 3.5.1
+July 10th, 2020
+
+### Bug Fixes:
+* Fixed HTTP request exception handling in `PollingConfigManager`. ([#285](https://github.com/optimizely/python-sdk/pull/285))
+
 ## 3.5.0
 July 9th, 2020
 

Diff for: optimizely/version.py

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