docs: update EMOTION_MIGRATION.md (#427)

* Update EMOTION_MIGRATION.md add some additional gotchas we ran into while migrating Mineral UI * Update EMOTION_MIGRATION.md remove invalid style array guidelines
paypal · Jun 6, 2018 · 747df62 · 747df62
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@@ -96,6 +96,14 @@ SomeComponent.defaultProps = {
 
 ```
 
+### Simulation of Pseudo Selectors
+
+Emotion doesn't support simulation of pseudo selectors. Glamor creates additional styles for `[data-simulate-*]` selectors in dev mode. Remove any `[data-simulate-*]` selectors that you still have in your styles and any calls to `glamor.simulate`.
+
+### Prop Filtering
+
+Emotion's prop filtering only looks at attributes that are valid for all DOM elements, whereas Glamorous uses the tag to determine which attributes are valid. 
+
 ## Possible Gotchas
 
 This list is not comprehensive please feel free to make adjustments or additions.