Update vscode engine to 1.30.0 to fix the build

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Author: fbricon

package.json

@@ -10,7 +10,7 @@
   "bugs": "https://github.com/redhat-developer/vscode-java/issues",
   "preview": true,
   "engines": {
-    "vscode": "^1.28.0"
+    "vscode": "^1.30.0"
   },
   "repository": {
     "type": "git",