bump minimum vscode version

bradlc · bradlc · commit 476799cfa5d1 · 2021-05-11T10:58:02.000+01:00
1.52.0 is required for the language client/server
diff --git a/package.json b/package.json
@@ -25,7 +25,7 @@
     "vscode"
   ],
   "engines": {
-    "vscode": "^1.33.0"
+    "vscode": "^1.52.0"
   },
   "categories": [
     "Linters",
