Merge pull request #396 from RalfJung/rust-1.36

fix mem::uninitialized deprecation schedule

Author: alexcrichton

posts/2019-07-04-Rust-1.36.0.md

@@ -89,7 +89,7 @@ The Rust compiler will understand that it should not assume that a [`MaybeUninit
 Therefore, you can do gradual initialization more safely and eventually use `.assume_init()`
 once you are certain that `maybe_t: MaybeUninit<T>` contains an initialized `T`.
 
-As [`MaybeUninit<T>`] is the safer alternative, starting with Rust 1.38,
+As [`MaybeUninit<T>`] is the safer alternative, starting with Rust 1.39,
 the function [`mem::uninitialized`] will be deprecated.
 
 To find out more about uninitialized memory, [`mem::uninitialized`],