Lock vscode types version to oldest supported

Also run tests as part of prepublish check

Author: iansan5653

package-lock.json

@@ -28,7 +28,7 @@
   ],
   "main": "./out/extension.js",
   "scripts": {
-    "vscode:prepublish": "npm run lint & npm run compile",
+    "vscode:prepublish": "npm run lint & npm run test",
     "compile": "tsc -p ./",
     "watch": "tsc -watch -p ./",
     "test": "npm run compile && npm run testWithoutCompile",
@@ -43,7 +43,7 @@
     "@types/glob": "^7.1.1",
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.12.8",
-    "@types/vscode": "^1.40.0",
+    "@types/vscode": "=1.36.0",
     "@typescript-eslint/eslint-plugin": "^2.7.0",
     "@typescript-eslint/parser": "^2.8.0",
     "eslint": "^6.6.0",