Update README.md with summit callout

[R4ph-t]

Adding a short announcement one-liner to bring visibility to GraphQL Summit

[changeset-bot]

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Latest commit: d871e4f

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[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	38.68 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	47.48 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	45.05 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	34.22 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	32.08 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.26 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.24 KB (0%)
import { useQuery } from "dist/react/index.js"	5.32 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.39 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.6 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.67 KB (0%)
import { useMutation } from "dist/react/index.js"	3.59 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.81 KB (0%)
import { useSubscription } from "dist/react/index.js"	3.23 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.43 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	5.47 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.12 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.98 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.63 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	5.04 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.69 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.35 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3.3 KB (0%)
import { useFragment } from "dist/react/index.js"	2.32 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.27 KB (0%)