chore: bump version and add changelog

docs/changelog/index.md

@@ -4,6 +4,7 @@ Release history for EchoHub.
 
 ## Releases
 
+- [v0.2.18](v0.2.18.md) - IRCv3 Capabilities
 - [v0.2.17](v0.2.17.md) - Server Version Reporting & IRC Multi-Line Fix
 - [v0.2.16](v0.2.16.md) - Periodic Server-Stats Report, Upload & Moderation Logging & Quieter Connection Logs
 - [v0.2.15](v0.2.15.md) - Invite Codes, Data Export & Deletion, /me, /banner, Replies, Open Images In Browser & IRC Image Links

docs/changelog/toc.yml

@@ -1,5 +1,7 @@
 - name: Overview
   href: index.md
+- name: v0.2.18
+  href: v0.2.18.md
 - name: v0.2.17
   href: v0.2.17.md
 - name: v0.2.16

docs/changelog/v0.2.18.md

@@ -0,0 +1,5 @@
+# v0.2.18
+
+## New Features
+
+- **IRCv3 capabilities** — `server-time`, `message-tags`, `echo-message`, `batch` and `draft/multiline` are now advertised and fully supported in the IRC gateway. CAP LS 302 requests receive capability values. Clients can enable caps via CAP REQ and disable them with CAP REQ -cap.