[clangd] Update dev dependencies of clangd-vscode

Summary:
The version bumps are a result of running `npm audit`, which found
3 security issues in previous versions of our dependencies.

Also add 'package-lock.json' to the repo, it's a common practice to
check in those files into the repository to get consistent versions of
dependencies when running on different machines.

Reviewers: hokein

Reviewed By: hokein

Subscribers: dschuff, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57814

llvm-svn: 353296

clang-tools-extra/clangd/clients/clangd-vscode/.gitignore

@@ -1,3 +1,2 @@
 out
 node_modules
-package-lock.json

clang-tools-extra/clangd/clients/clangd-vscode/package.json

@@ -38,11 +38,11 @@
         "vscode-languageserver": "^5.2.0"
     },
     "devDependencies": {
-        "typescript": "^2.0.3",
-        "vscode": "^1.1.0",
-        "mocha": "^2.3.3",
+        "@types/mocha": "^2.2.32",
         "@types/node": "^6.0.40",
-        "@types/mocha": "^2.2.32"
+        "mocha": "^5.2.0",
+        "typescript": "^2.0.3",
+        "vscode": "^1.1.0"
     },
     "repository": {
         "type": "svn",