Bump version to 1.13

Author: gtsiolis

manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 2,
   "name": "Gitpod - Always ready to code",
   "short_name": "Gitpod",
-  "version": "1.12",
+  "version": "1.13",
   "description": "Spin up fresh, automated dev environments for each task, in the cloud, in seconds.",
   "icons": {
     "16": "icons/gitpod-logo-16.png",