Relay: do not enforce project wide configuration

This feature was requested here adeira/universe#189 and was greatly improved in Babel itself here babel/babel#10778. It can however be annoying and sometimes difficult to do such modification so I changed my mind and I'd like to allow it after all. It's because this code where we require "upward" mode is necessary only for Universe development and should not affect users of our NPM package.

adeira-source-id: a7917273c3a7861fa3f355e38c9ab732a9b1d150

package.json

@@ -5,7 +5,7 @@
   "private": true,
   "dependencies": {
     "@adeira/fetch": "^1.0.0",
-    "@adeira/relay": "^0.5.0",
+    "@adeira/relay": "^0.6.0",
     "@adeira/js": "^0.2.0",
     "@kiwicom/orbit-components": "^0.68.0",
     "date-fns": "^2.8.1",