Pick up ts 3.1-rc

extensions/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "description": "Dependencies shared by all extensions",
   "dependencies": {
-    "typescript": "3.0.3"
+    "typescript": "3.1.0-rc.20180911"
   },
   "scripts": {
     "postinstall": "node ./postinstall"

extensions/yarn.lock

@@ -2,6 +2,6 @@
 # yarn lockfile v1
 
 
-typescript@3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
+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"