Update README to include point release instructions (#536) #18

Job	Run time
Extract tasks from matrix	3s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://try-runtime.polkadot.io:443, ...	40m 41s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://try-runtime-kusama.polkadot...	2h 3m 11s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	28m 26s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	1h 2m 9s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	24m 18s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	6s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	24m 37s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	24m 1s
check-migrations (coretime-polkadot, coretime-polkadot-runtime, system-parachains/coretime/coreti...	23m 47s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	23m 16s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	23m 32s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	23m 55s
All migrations passed	0s
	7h 2m 2s

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