Fix import

src/util.ts

@@ -8,7 +8,7 @@ import * as vscode from 'vscode';
 import * as cp from 'child_process';
 import { rGuestService, isGuestSession } from './liveShare';
 import { extensionContext } from './extension';
-import { kill } from 'process';
+import * as kill from 'tree-kill';
 
 export function config(): vscode.WorkspaceConfiguration {
     return vscode.workspace.getConfiguration('r');