-Version 0.1 (2014-05-??)
+Version 0.4 (2016-07-??)
+
+ Use grako instead of PLY to compile EBNF to Python.
+
+Version 0.3 (2014-06-22)
+
+ Allow '&&', '||', ' AND ', ' and ', ' OR ', ' or ', 'NOT ' and 'not '.
+
+Version 0.2 (2014-06-06)
+
+ Ignore spaces.
+
+Version 0.1 (2014-05-20)
First release. Very simple grammar.