update CHANGELOG.org

Author: Ron89

CHANGELOG.org

@@ -4,6 +4,7 @@
   This log is kept according to the [[http://keepachangelog.com/][Keep a CHANGELOG]] manifesto
 ** 0.6.0                  					 :unreleased:
 *** Added
+    - Introduced sphinx documentation to Python modules. (PR #237)
     - Add =Python3= support. (closes issue #226, merge PR #231)
     - Implementing agenda overview for current buffer. (merges PR #229)
     - =g:org_aggressive_conceal=, if value =1=, will conceal all simple format
@@ -17,6 +18,7 @@
     - Add export as LaTeX beamer slides (merges PR #206)
     - Keybinding to create plainlist item directly. (closes issue #190)
 *** Changed
+    - Revamped TODO keyword cycling rules. (PR #237)
     - In [[syntax/org.vim][syntax/org.vim]], changed `\@<=' with computational faster `\zs'
     - Using =<localleader>c[n/N]= to create new plainlist item following
       current plainlist item. Now these keybindings will unconditionally