Automatic update from web-platform-tests
Remove 'tentative' from JSON module script filenames
Remove 'tenative' from JSON module script test filenames now that the
HTML spec PR [1] is about to land.
Also delete out-of-date README.
[1] https://github.com/whatwg/html/pull/5658
Bug: 1132413
Change-Id: I306b5deddefc448d2b43f83942c490f2b217a565
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3059740
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#906733}
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wpt-commits: 711b29c9ac887e0c72ea2bc16a29dd9b2fd78e24
wpt-pr: 29830
