DOC: Update changelog for 0.6.0

CHANGELOG.md

@@ -1,7 +1,26 @@
 Recent Changes (arrayvec)
--------------------------
+=========================
 
-- 0.5.2
+## 0.6.0
+
+- The **const generics** release 🎉. Arrayvec finally implements what it
+  wanted to implement all along, since its first version; a vector backed by
+  and array, with generic parameters for the arbitrary element type
+  and backing array capacity.
+
+  New type syntax is `ArrayVec<T, CAP>` where CAP is the arrayvec capacity.
+  For arraystring the syntax is `ArrayString<CAP>`.
+  By @bluss.
+
+- Arrayvec's `.extend()` and `FromIterator`/`.collect()` to arrayvec now
+  **panic** if the capacity of the arrayvec is exceeded.  By @bluss.
+
+- Arraystring now implements `TryFrom<&str>` and `TryFrom<fmt::Arguments>` by
+  @c410-f3r
+
+- Minimum supported rust version is Rust 1.51
+
+## 0.5.2
 
 - Add `is_empty` methods for ArrayVec and ArrayString by @nicbn
 - Implement `TryFrom<Slice>` for ArrayVec by @paulkernfeld
@@ -12,7 +31,7 @@ Recent Changes (arrayvec)
 - Remove deprecated `Error::description` by @AnderEnder
 - Use pointer method `add` by @hbina
 
-- 0.5.1
+## 0.5.1
 
 - Add `as_ptr`, `as_mut_ptr` accessors directly on the `ArrayVec` by @tbu-
   (matches the same addition to `Vec` which happened in Rust 1.37).
@@ -25,12 +44,12 @@ Recent Changes (arrayvec)
 - Changed inline hints on many methods, mainly removing inline hints
 - `ArrayVec::dispose` is now deprecated (it has no purpose anymore)
 
-- 0.4.12
+## 0.4.12
 
 - Use raw pointers instead of `get_unchecked_mut` where the target may be
   uninitialized everywhere relevant in the ArrayVec implementation.
 
-- 0.5.0
+## 0.5.0
 
 - Use `MaybeUninit` (now unconditionally) in the implementation of
   `ArrayVec`