Update CHANGELOG.rst

CHANGELOG.rst

@@ -8,3 +8,9 @@ If you have the "lorem ipsum" module then your text will be edited with
 a randomly generated piece of text. This prevents Reddit from (for example)
 not actually deleting things if they edit the comment to a static value
 before deleting.
+
+3.0
+--------
+PEP8 compliance and complete rewrite to use Python 3. Don't upgrade to this
+version unless you have a working Python 3 (tested with Python 3.4).
+Also added a requirements.txt which allows one to `pip install -r requirements.txt`