Add CDT-LSP 3.1.0 to changelog/readme (#481)

Author: jonahgraham

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## CDT LSP Change Log
 
+### v3.1.0 (Apr 2024)
+
+Fixed issues: <https://github.com/eclipse-cdt/cdt-lsp/milestone/5?closed=1>
+
 ### v3.0.0 (Mar 2024)
 
 Fixed issues: <https://github.com/eclipse-cdt/cdt-lsp/milestone/4?closed=1>

README.md

@@ -183,8 +183,8 @@ For plug-in dependencies the MANIFEST.MF's dependency information will provide t
 
 | CDT LSP Version | clangd | cmake* | Eclipse IDE Release |
 |:-:|:-:|:-:|:-:|
-| 3.0.x | 17.0.x | 3.x | 2025-03 |
-| 2.0.x | 17.0.x | 3.x | 2024-06 |
+| 3.x.x | 17.0.x | 3.x | 2025-03 |
+| 2.x.x | 17.0.x | 3.x | 2024-06 |
 | 1.1.x | 17.0.x | 3.x | 2023-12 |
 | 1.0.x | 15.0.x | 3.x | 2023-09 |