chore(deps): update dependency @types/zen-observable to v0.5.3

Author: renovate-bot

packages/graphql-playground-react/package.json

@@ -44,7 +44,7 @@
     "@types/node": "9.4.0",
     "@types/react": "16.0.34",
     "@types/react-dom": "16.0.3",
-    "@types/zen-observable": "^0.5.3",
+    "@types/zen-observable": "0.5.3",
     "autoprefixer": "7.2.5",
     "babel-cli": "6.26.0",
     "babel-core": "6.26.0",

packages/graphql-playground-react/yarn.lock

@@ -187,7 +187,7 @@
   dependencies:
     "@types/node" "*"
 
-"@types/[email protected]", "@types/zen-observable@^0.5.3":
+"@types/[email protected]":
   version "0.5.3"
   resolved "https://registry.yarnpkg.com/@types/zen-observable/-/zen-observable-0.5.3.tgz#91b728599544efbb7386d8b6633693a3c2e7ade5"