Update changelog and version

ChangeLog.md

@@ -1,3 +1,8 @@
+# 10.2.1 - TBD
+
+-   Fixed ABI compatibility with earlier 10.x versions
+    (https://github.com/fmtlib/fmt/pull/3786). Thanks @saraedum.
+
 # 10.2.0 - 2024-01-01
 
 -   Added support for the `%j` specifier (the number of days) for

include/fmt/core.h

@@ -18,7 +18,7 @@
 #include <type_traits>
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 100200
+#define FMT_VERSION 100201
 
 #if defined(__clang__) && !defined(__ibmxl__)
 #  define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)