docs(CHANGES): Update

Author: tony

CHANGES

@@ -11,6 +11,9 @@ current
   @jfindlay! Fixes :issue:`654`
 - :issue:`666` CI: Move test plugin packages from pyproject.toml to 
   pytest fixtures. Fixes :issue:`658`
+- Bump minimum version 3.5 -> 3.6
+- Drop python 2.7 support
+- Modernize syntax (remove ``__future__`` and modesets)
 - *Insert changes/features/fixes for next release here*
 
 tmuxp 1.7.2 (2021-02-03)