Increase extension version in metadata.json

Author: lucasresck

metadata.json

@@ -2,7 +2,7 @@
   "uuid": "alt-tab-scroll-workaround@lucasresck.github.io",
   "name": "Alt+Tab Scroll Workaround",
   "description": "Temporary fix for a bug that buffers the scroll between different windows (e.g., Chrome and VS Code).",
-  "version": 3,
+  "version": 4,
   "shell-version": [
     "42",
     "43",