[lldb-dap] Bump the version to 0.2.18

Bump the version to 0.2.18 to address the missing chokidar dependency in
the .vsix.
diff --git a/lldb/tools/lldb-dap/package.json b/lldb/tools/lldb-dap/package.json
index 3c504e0..e961c2e 100644
--- a/lldb/tools/lldb-dap/package.json
+++ b/lldb/tools/lldb-dap/package.json
@@ -1,7 +1,7 @@
 {
   "name": "lldb-dap",
   "displayName": "LLDB DAP",
-  "version": "0.2.17",
+  "version": "0.2.18",
   "publisher": "llvm-vs-code-extensions",
   "homepage": "https://lldb.llvm.org",
   "description": "Debugging with LLDB in Visual Studio Code",