Update CHANGES.rst

CHANGES.rst

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 Changelog
 =========
 
+5.0.3 (unreleased)
+------------------
+
 Update parser.py:
 
 - All ``format`` strings converted to python3.6+ compliant ``f-strings``.
 - Optimised rudimentary returns with equivalent boolean statements.
+- Converted ``for i in range()`` construct with an equivalent ``enumerate`` in ``q_split`` function.
+
+Breaking changes:
+
+- ...
+
+New features:
+
+- ...
+
+Bug fixes:
+
+- ...
 
 5.0.2 (unreleased)
 ------------------