double rename

docs/migration/v4-migration.md

@@ -30,7 +30,7 @@ A number of changes were made to the configuration options passed to the `Chart`
 * Time and timeseries scales use `ticks.stepSize` instead of `time.stepSize`, which has been removed.
 * `maxTickslimit` wont be used for the ticks in `autoSkip` if the determined max ticks is less then the `maxTicksLimit`.
 * `dist/chart.js` has been removed.
-* `dist/chart.min.js` has been renamed to `dist/chart.umd.min.js`.
+* `dist/chart.min.js` has been renamed to `dist/chart.umd.min.js` (and before 4.5.0 `dist/chart.umd.js`).
 * `dist/chart.esm.js` has been renamed to `dist/chart.js`.
 
 #### Type changes