Add some notes about the next release.

CHANGES.md

+0.2
+---
+
+(unreleased)
+
+* Add 'edit' subcommand to launch an editor.
+* Introduced textual identifiers in addition to line numbers.
+
+  Line numbers are still the default, textual identifiers can be enabled with
+  the option 'identifiers = text' in the configuration file (see topydo.conf).
+  The advance of these identifiers is that they are less prone to changes when
+  something changes in the todo.txt file. For example, identifiers are much more
+  likely to remain the same when completing a todo item (and archiving it). With
+  linenumbers, all todo items below the completed one would get a new
+  identifier.
+* Added option to automatically add the projects of the parent todo item when
+  adding a child todo item. Enable append_parent_projects in topydo.conf.
+
 0.1.2
-=====
+-----
 
 * Handle recurrence properly when a custom completion date is given.
 * Allow any tag to have a date value (so it can be filtered as such).
 
 0.1.1
-=====
+-----
 
 * Write newline character at the end of todo.txt and done.txt files.
 * Tag values must be at least one character long.
 * Made filtering a bit more robust w.r.t. integer expressions.
 
 0.1
-===
+---
 
 Initial release.