Add changelog entry for transliterate/parameterize accepting `locale` [ci skip]

activesupport/CHANGELOG.md

+*   Add support for supplying `locale` to `transliterate` and `parameterize`
+
+        I18n.backend.store_translations(:de, i18n: { transliterate: { rule: { "ü" => "ue" } } })
+
+        ActiveSupport::Inflector.transliterate("ü", locale: :de) => "ue"
+        "Fünf autos".parameterize(locale: :de) => "fuenf-autos"
+        ActiveSupport::Inflector.parameterize("Fünf autos", locale: :de) => "fuenf-autos"
+
+    *Kaan Ozkan*, *Sharang Dashputre*
+
 *   Allow Array#excluding and Enumerable#excluding to deal with a passed array gracefully.
 
         [ 1, 2, 3, 4, 5 ].excluding([4, 5]) => [ 1, 2, 3 ]