package.json: update dev version

For golang#2341.

Change-Id: I0f2f8f13720f67e3f70c00270947d98fadc2495e
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/418074
Run-TryBot: Jamal Carvalho <jamal@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: jamalc

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "go",
   "displayName": "Go",
-  "version": "0.35.0-dev",
+  "version": "0.36.0-dev",
   "preview": true,
   "publisher": "golang",
   "description": "Rich Go language support for Visual Studio Code",