Update MIGRATION.md

* add note about the fact that the `SecondaryDrawerItem` extends the `PrimaryDrawerItem` now
hamsaadev · Apr 25, 2016 · 640b1cc · 640b1cc
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 ###Upgrade Notes
 
+#### v5.2.0 -> v5.2.1
+* the `SecondaryDrawerItem` is now a subclass of the `PrimaryDrawerItem` (extends `PrimaryDrawerItem`). If you have an `if` which checks for the type with `instanceOf` make sure you check for the `SecondaryDrawerItem` first. (`secondaryDrawerItem instanceOf PrimaryDrawerItem == true`)
+
 #### v5.1.6 -> 5.1.8
 * if you use the `FastAdapter` please check out the release notes of v1.4.0 (https://github.com/mikepenz/FastAdapter/releases/tag/v1.4.0)