Fix typo in date

Latest release was labeled 2019, should be 2020

Author: thisjustin

CHANGELOG.md

@@ -11,7 +11,7 @@ Ideally, within a virtual environment.
 
 Changelog
 =========
-### 2.6.1 - February 6, 2019
+### 2.6.1 - February 6, 2020
 - Fixed issue #834: Bug in some cases when introspecting local documentation.
 
 ### 2.6.0 - August 29, 2019