Merge pull request #98 from rust-lang/nrc-patch-1

Fix typo in "async_trait"

Author: tmandry

src/07_workarounds/06_async_in_traits.md

@@ -5,7 +5,7 @@ somewhat complex, but there are plans to remove this restriction in the
 future.
 
 In the meantime, however, this can be worked around using the
-[`async_trait` crate from crates.io](https://github.com/dtolnay/async-trait).
+[async-trait crate from crates.io](https://github.com/dtolnay/async-trait).
 
 Note that using these trait methods will result in a heap allocation
 per-function-call. This is not a significant cost for the vast majority