packet: tag v1.1.0

Signed-off-by: Matt Layher <mdlayher@gmail.com>

CHANGELOG.md

@@ -1,9 +1,17 @@
 # CHANGELOG
 
-## Unreleased
+# v1.1.0
+
+**This is the first release of package packet that only supports Go 1.18+. Users
+on older versions of Go must use v1.0.0.**
+
+- [Improvement]: drop support for older versions of Go so we can begin using
+  modern versions of `x/sys` and other dependencies.
 
 ## v1.0.0
 
+**This is the last release of package vsock that supports Go 1.17 and below.**
+
 - Initial stable commit! The API is mostly a direct translation of the previous
   `github.com/mdlayher/raw` package APIs, with some updates to make everything
   focused explicitly on Linux and `AF_PACKET` sockets. Functionally, the two