Add Changelog entry for additional getters

Signed-off-by: Max Fillinger <max@max-fillinger.net>
diff --git a/ChangeLog.d/additional_cipher_info_getters.txt b/ChangeLog.d/additional_cipher_info_getters.txt
new file mode 100644
index 0000000..5cb1ad6
--- /dev/null
+++ b/ChangeLog.d/additional_cipher_info_getters.txt
@@ -0,0 +1,3 @@
+Features
+   * Add functions to get the IV and block size from cipher_info structs.
+   * Add functions to check if a cipher supports variable IV or key size.