Prepare v0.15.0 release

This release mainly improve support for macOS/BSD systems for vhost-user
supporting sock_ctrl_msg on POSIX and adding a cross platform event
notification that uses EventFd when available or pipe().

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

Author: stefano-garzarella

CHANGELOG.md

@@ -2,17 +2,17 @@
 
 ## Upcoming
 
--[[#245](https://github.com/rust-vmm/vmm-sys-util/pull/245)]: Make sock_ctrl_msg support unix.
+## v0.15.0
 
 ### Added
 
+- [[#245](https://github.com/rust-vmm/vmm-sys-util/pull/245)]: Make sock_ctrl_msg support non-linux unix platforms.
 - [[#244](https://github.com/rust-vmm/vmm-sys-util/pull/244)]: 
   - Impl `IntoRawFd` for `linux::eventfd::EventFd`.
   - Use `File::try_clone` to replace the original implementation of `EventFd::try_clone`.
   Some flags can now be propagated, like `CLOEXEC`.
   - Add `EventNotifier` and `EventConsumer` as a generic event notification 
 
-
 ## v0.14.0
 
 ### Changed

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vmm-sys-util"
-version = "0.14.0"
+version = "0.15.0"
 authors = ["Intel Virtualization Team <vmm-maintainers@intel.com>"]
 description = "A system utility set"
 repository = "https://github.com/rust-vmm/vmm-sys-util"