Add PR from https://www.reddit.com/r/rust/comments/3i90qi/this_week_in_rust_93/cum47pe

Author: nasa42

content/2015-08-31-this-week-in-rust.md

@@ -91,6 +91,7 @@ decision. Express your opinions now. [This week's FCPs][fcp] are:
 * [Add a new `ToOpt` trait and have `bool` implement it](https://github.com/rust-lang/rfcs/issues/1265).
 * [`macro_rules!` should support gensym for creating items](https://github.com/rust-lang/rfcs/issues/1266).
 * [Implement `.drain(range)` and `.drain()` respectively as appropriate on collections](https://github.com/rust-lang/rfcs/pull/1257).
+* [UX guidelines for the Rust compiler](https://github.com/rust-lang/rfcs/pull/1246).
 * [TRPLF] [Pauseless Concurrent Garbage Collector](https://users.rust-lang.org/t/rfc-pauseless-concurrent-garbage-collector/2624).
 
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