Announce xeus-cpp v0.5

Author: vgvassilev

_data/releases.yml

@@ -1,3 +1,13 @@
+- date: 2024-06-04
+  codebase: "Xeus-Cpp"
+  version: "v0.5"
+  description: |
+    This release merges most of the features available in xeus-clang-repl.
+    Implements code completion and drops `xtl` as a dependency. The release adds
+    a new kernel C++20 and drops C++11 and C++14 kernels as we upgraded to xeus
+    5.
+  link: "https://github.com/compiler-research/xeus-cpp/releases/tag/0.5.0"
+
 - date: 2024-05-21
   codebase: "Clad"
   version: "v1.5"