Add changelog

Signed-off-by: irwir <irwir@users.noreply.github.com>
diff --git a/ChangeLog.d/bugfix.txt b/ChangeLog.d/bugfix.txt
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+Bugfix
+   * Fix the Visual Studio Release x64 build configuration for mbedtls itself.
+     Completes a previous fix in Mbed TLS 2.19 that only fixed the build for
+     the example programs. Reported in #1430 and fix contributed by irwir.
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