Update vscode engine version

TheZoker · edgarmueller · commit 6b99edf244d5 · 2019-06-25T15:50:01.000+02:00
diff --git a/vscode-extension/package.json b/vscode-extension/package.json
@@ -13,7 +13,7 @@
   },
   "displayName": "JSONForms Tooling",
   "engines": {
-    "vscode": "^1.28.0"
+    "vscode": "^1.34.0"
   },
   "categories": [
     "Other"
