update changelog

changelog-versions/15.2.0.md

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+## 🔄 Changed
+
+- Add Prefix to input fields [#1887](https://github.com/Telefonica/mistica-design/issues/1887)
+- Include right and left position in Popover [#1932](https://github.com/Telefonica/mistica-design/issues/1932)
+- Include variant for "background NavBar" in Modal NavBars [#1938](https://github.com/Telefonica/mistica-design/issues/1938)
+- → Inverse | Controls inverse variant [#736](https://github.com/Telefonica/mistica-design/issues/736)
+- → Inverse | Progress bar [#1655](https://github.com/Telefonica/mistica-design/issues/1655)
+- → Inverse | Slider [#1936](https://github.com/Telefonica/mistica-design/issues/1936)
+
+## 🐞 Bugs fixed
+
+- Pin Field (icon-warning-regular) [#1937](https://github.com/Telefonica/mistica-design/issues/1937)
+- Snackbar missing variables [#1939](https://github.com/Telefonica/mistica-design/issues/1939)
+
+## O<sub>2<sub>
+
+- ThumbsDown icon in o2 is missing [#1878](https://github.com/Telefonica/mistica-design/issues/1878)
+
+## Telefónica
+
+- Update the color of the Telefonica barTrack [#1924](https://github.com/Telefonica/mistica-design/issues/1924)
+
+## ⚙️ Icon changes
+
+- New icons in Telefónica set [#1920](https://github.com/Telefonica/mistica-design/issues/1920)
+- ThumbsDown icon in o2 is missing [#1878](https://github.com/Telefonica/mistica-design/issues/1878)