message: docs(subscriptions): change websocket protocol prefix
diff: @@ -48,7 +48,7 @@ package](https://github.com/apollographql/subscriptions-transport-ws).
  import { Client, defaultExchanges, subscriptionExchange } from 'urql';
  import { SubscriptionClient } from 'subscriptions-transport-ws';
  -const subscriptionClient = new SubscriptionClient('wss://localhost/graphql', { reconnect: true });
  +const subscriptionClient = new SubscriptionClient('ws://localhost/graphql', { reconnect: true });
  const client = new Client({
  url: '/graphql',
  @@ -79,7 +79,7 @@ import { createClient, defaultExchanges, subscriptionExchange } from 'urql';
  import { createClient as createWSClient } from 'graphql-ws';
  const wsClient = createWSClient({
  - url: 'wss://localhost/graphql',
  + url: 'ws://localhost/graphql',
  });
  const client = createClient({
  