Add changelog

CHANGELOG.md

@@ -0,0 +1,12 @@
+# Changelog
+
+## Unreleased
+
+* Remove `cty` and `cstr_core` dependencies.
+  <https://github.com/lights0123/printf-compat/pull/4>
+* Improve integer conversions to match C's behavior.
+  <https://github.com/lights0123/printf-compat/pull/11>
+* Update `itertools` dependency to 0.14.0.
+  <https://github.com/lights0123/printf-compat/pull/17>
+* Update `bitflags` dependency to 2.9.1.
+  <https://github.com/lights0123/printf-compat/pull/18>