fix doc link

Author: bckohan

doc/source/changelog.rst

@@ -5,7 +5,7 @@ Change Log
 v1.2.0
 ======
 
-* Implemented `Drop support for < Python3.6 <https://github.com/bckohan/enum-properties/issues/6>_`
+* Implemented `Drop support for < Python3.6 <https://github.com/bckohan/enum-properties/issues/6>`_
 * Fixed `Add types and support for Flag and IntFlag <https://github.com/bckohan/enum-properties/issues/5>`_
 
 v1.1.1