Pick up new TS insiders

extensions/package.json

@@ -3,9 +3,9 @@
   "version": "0.0.1",
   "description": "Dependencies shared by all extensions",
   "dependencies": {
-    "typescript": "3.1.0-rc.20180911"
+    "typescript": "3.1.0-insiders.20180920"
   },
   "scripts": {
     "postinstall": "node ./postinstall"
   }
-}
+}
\ No newline at end of file

extensions/yarn.lock

@@ -2,6 +2,6 @@
 # yarn lockfile v1
 
 
-typescript@3.1.0-rc.20180911:
-  version "3.1.0-rc.20180911"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.0-rc.20180911.tgz#73654821f9064dfe75a0440899ff0e2238338584"
+typescript@3.1.0-insiders.20180920:
+  version "3.1.0-insiders.20180920"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.0-insiders.20180920.tgz#c113741f3f701aad6f14170d4a03820005bcf3e9"