remove relay-devtools and @types/node patch

Author: ds300

example/package.json

@@ -32,7 +32,6 @@
     "react": "^16.10.2",
     "react-dom": "^16.10.2",
     "react-relay": "^6.0.0",
-    "relay-devtools": "^1.4.0",
     "relay-runtime": "^6.0.0",
     "todomvc-app-css": "^2.1.0",
     "todomvc-common": "^1.0.3",
@@ -51,6 +50,7 @@
     "csstype": "^2.5.6",
     "fork-ts-checker-webpack-plugin": "^0.3.0",
     "patch-package": "^6.2.0",
+    "postinstall-postinstall": "^2.0.0",
     "relay-compiler": "^6.0.0",
     "relay-compiler-language-typescript": "file:.yalc/relay-compiler-language-typescript",
     "ts-loader": "^6.2.0",