Update README.rst

[MonkeyKing44]

fix old link

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This change is 

[mkow]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: ITL)

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-- commits line 2 at r1:

Suggestion:

Update an outdated link in README.rst

[kailun-qin]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @MonkeyKing44)

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-- commits line 1 at r1:
@MonkeyKing44: Pls also add your sign-off.