Update changelog

Author: vitaut

ChangeLog.md

@@ -1,11 +1,8 @@
-# 11.1.5 - TBD
+# 11.2.0 - TBD
 
 - Fixed compilation with GCC 15 and C++20 modules enabled
   (https://github.com/fmtlib/fmt/pull/4347). Thanks @tkhyn.
 
-- Worked around an ABI issue in spdlog
-  (https://github.com/fmtlib/fmt/issues/4385).
-
 - Fixed handling of named arguments in format specs
   (https://github.com/fmtlib/fmt/issues/4360,
   https://github.com/fmtlib/fmt/pull/4361). Thanks @dinomight.