chore: Bump version to 0.7.0, 1st beta

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.7.0] - 2026-03-20
+
+First beta release!
+
+### Added
+- Configurable WebSocket keepalive support in `Parrhesia.Web.Connection`:
+  - server-initiated `PING` frames
+  - `PONG` timeout handling with connection close on timeout
+- New runtime limit settings:
+  - `:websocket_ping_interval_seconds` (`PARRHESIA_LIMITS_WEBSOCKET_PING_INTERVAL_SECONDS`)
+  - `:websocket_pong_timeout_seconds` (`PARRHESIA_LIMITS_WEBSOCKET_PONG_TIMEOUT_SECONDS`)
+
+### Changed
+- NIP-42 challenge validation now uses constant-time comparison via `Plug.Crypto.secure_compare/2`.