rel: Prepare v1.14.0 release (#404)

## Which problem is this PR solving?
Prepares the v1.14.0 release.

## Short description of the changes
- Update version to 1.14.0 in version.go
- Add changelog entry

---------

Co-authored-by: Robb Kidd <robbkidd@honeycomb.io>

CHANGELOG.md

@@ -1,5 +1,19 @@
 # beeline-go changelog
 
+## 1.14.0 2023-12-04
+
+### Enhancements
+
+- perf: speed up adding fields, reduce memalloc if field name is already prefixed with "app." (#406) | @robbkidd
+
+### Maintenance
+
+- maint(deps): bump github.com/labstack/echo/v4 from 4.11.1 to 4.11.3 (#403) | @dependabot
+- maint(deps): bump golang.org/x/net from 0.12.0 to 0.17.0 (#396) | @dependabot
+- maint(deps): bump github.com/google/uuid from 1.3.0 to 1.4.0 (#398) | @dependabot
+- maint(deps): bump github.com/felixge/httpsnoop from 1.0.3 to 1.0.4 (#408) | @dependabot
+- maint(deps): bump github.com/gorilla/mux from 1.8.0 to 1.8.1 (#407) | @dependabot
+
 ## 1.13.0 2023-07-31
 
 ### ⚠️ Breaking Changes ⚠️

version.go

@@ -1,3 +1,3 @@
 package beeline
 
-const version = "1.13.0"
+const version = "1.14.0"