rel: Prepare v1.18.0 release (#447)

## Which problem is this PR solving?

Prepares the next release of beeline-go.

## Short description of the changes
- Add changelog entry
- Update version to 1.18.0

CHANGELOG.md

@@ -1,5 +1,15 @@
 # beeline-go changelog
 
+## 1.18.0 2024-11-22
+
+### Maintenance
+
+- docs: update vulnerability reporting process (#442) | @robbkidd
+- maint: Update libhoney-go to 1.24.0 (#446) | @MikeGoldsmith
+- maint: Update README.md (#441) | @codeboten
+- maint(build): add 1.23 to supported versions (#445) | @lizthegrey
+- maint(deps): bump golang.org/x/net from 0.20.0 to 0.23.0 (#436) | @dependabot
+
 ## 1.17.0 2024-06-13
 
 ### Maintenance

version.go

@@ -1,3 +1,3 @@
 package beeline
 
-const version = "1.17.0"
+const version = "1.18.0"