Set to v1.2.0 because of prerelease policy of VSCode Marketplace

Author: RinkeHoekstra

package.json

@@ -8,7 +8,7 @@
   },
   "repository": "https://github.com/elsevierlabs-os/linked-data",
   "description": "This extension provides shortcuts for standard Linked Data operations, format conversions, validation, querying and a graph visualization.",
-  "version": "1.2.0-beta1",
+  "version": "1.2.0",
   "icon": "media/img/lde-icon.png",
   "engines": {
     "vscode": "^1.75.0"