update changelog with zero-length access fix

Signed-off-by: Alexandru Agache <[email protected]>

Author: alexandruag

CHANGELOG.md

@@ -1,6 +1,13 @@
-# [v0.2.0]
+# Changelog 
+## [Unreleased]
 
-## Added
+### Fixed
+- [[#106]](https://github.com/rust-vmm/vm-memory/issues/106): Asserts trigger
+  on zero-length access.  
+
+## [v0.2.0]
+
+### Added
 
 - [[#76]](https://github.com/rust-vmm/vm-memory/issues/76): Added `get_slice` and
   `as_volatile_slice` to `GuestMemoryRegion`.
@@ -10,9 +17,9 @@
   `ByteValued` which can be used for reading into POD structures from
   raw bytes.
 
-# [v0.1.0]
+## [v0.1.0]
 
-## Added
+### Added
 
 - Added traits for working with VM memory.
 - Added a mmap based implemention for the Guest Memory.