Release: bump to v0.2.4

Carries d46aeee — the Atom <title>/<subtitle> parser now honors
the type="" attribute (text vs html) and stops rendering raw HTML
markup as visible title text on feeds that mark their titles as
type="text".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: skeeto

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(elfeed2 VERSION 0.2.3 LANGUAGES C CXX)
+project(elfeed2 VERSION 0.2.4 LANGUAGES C CXX)
 
 # Local CMake modules (helpers + per-dep Fetch<X>.cmake files).
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")