Hi Brian,
As far as I know, a Moodle versions feature comparison chart doesn't yet exist. However, the release notes list all features added to each version of Moodle. If you feel like creating a chart to display the information, please add it to Moodle Docs, say here: http://docs.moodle.org/en/Moodle_versions_features_comparison.
Comparisons and advocacy
Feature comparision chart for all Moodle versions?
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