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docs: remove v2 notice from top of README #4385

Job	Run time
checks / pre-commit	1m 1s
checks / readme-snippets	17s
checks / test (3.11, locked, windows-latest)	2m 9s
checks / test (3.12, lowest-direct, windows-latest)	2m 19s
checks / test (3.12, locked, windows-latest)	2m 27s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.10, locked, ubuntu-latest)	1m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.14, locked, windows-latest)	2m 7s
checks / test (3.13, locked, windows-latest)	2m 11s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 35s
checks / test (3.13, lowest-direct, windows-latest)	2m 22s
checks / test (3.11, locked, ubuntu-latest)	1m 31s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 39s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.13, locked, ubuntu-latest)	1m 27s
checks / test (3.14, locked, ubuntu-latest)	1m 28s
checks / test (3.12, locked, ubuntu-latest)	1m 48s
checks / docs	1m 2s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.11, lowest-direct, windows-latest)	2m 15s
checks / test (3.10, lowest-direct, windows-latest)	2m 24s
all-green	4s
	39m 19s