[clangd] Add .vscode-test to .gitignore.

Reviewers: jvikstrom

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D66949

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@370446 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/clangd/clients/clangd-vscode/.gitignore b/clangd/clients/clangd-vscode/.gitignore
index 5df8049..a73617e 100644
--- a/clangd/clients/clangd-vscode/.gitignore
+++ b/clangd/clients/clangd-vscode/.gitignore
@@ -1,2 +1,3 @@
 out
 node_modules
+.vscode-test