chore(package): Add xstate as a dependency.

Author: cartant

panel/package.json

@@ -58,6 +58,7 @@
     "ts-action-operators": "^3.0.0",
     "ts-node": "~3.2.0",
     "tslint": "~5.3.2",
-    "typescript": "~2.6.1"
+    "typescript": "~2.6.1",
+    "xstate": "^1.2.1"
   }
 }

panel/yarn.lock

@@ -6174,6 +6174,10 @@ [email protected]:
   version "1.5.3"
   resolved "https://registry.yarnpkg.com/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.3.tgz#185a888c04eca46c3e4070d99f7b49de3528992d"
 
+xstate@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/xstate/-/xstate-1.2.1.tgz#24189c9085098360dd1a75855552842ade01300d"
+
 xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"