Add objection to increase Simplicity ranking to 🥈 (#1660)

Co-authored-by: Benjie <[email protected]>

Author: martinbonnin

rfcs/SemanticNullability.md

@@ -314,7 +314,7 @@ The implementation required to make the proposal work should be simple.
 | --------------- | --------------- | --------------- | --------------- |-----------------|
 | ✅              | 🚫              | 🚫              | 🚫              | ✅             |
 
-Criteria score: 🥉
+Criteria score: 🥈
 
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