Add try_trait_v2 RFC, which just hit FCP

Author: scottmcm

draft/2021-04-07-this-week-in-rust.md

@@ -137,6 +137,7 @@ decision. Express your opinions now.
 * [disposition: postpone] [RFC: Delegation](https://github.com/rust-lang/rfcs/pull/2393)
 * [disposition: close] [RFC: `#[derive_no_bound(..)]` and `#[derive_field_bound(..)]`](https://github.com/rust-lang/rfcs/pull/2353)
 * [disposition: postpone] [RFC: Eager Macro Expansion](https://github.com/rust-lang/rfcs/pull/2320)
+* [disposition: merge] [try_trait_v2: A new design for the `?` desugaring](https://github.com/rust-lang/rfcs/pull/3058)
 
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