Fix prefixItems index reporting in ValidationError

ba3a90534 Merge pull request #523 from olegshtch/extendible-schema-test-suite
458e7ac1e Add test suite to test dynamic reference and anchor link and their independency of order
fe405a119 draft/future -> draft/next in $refs also
3d9d35a2a Merge pull request #522 from json-schema-org/ether/draft-next
11b5076f0 rename draft-future to draft-next
0245dcc94 Merge pull request #521 from olegshtch/add-recursive-ref-test-suite
e9fb9cf45 Merge pull request #517 from ChALkeR/chalker/date-time-leap
f1b230c69 Add test from Appendix C.  Example of recursive schema extension of the draft.
bb2e37317 Test date-time with leap second on a wrong hour/minute
8b797cfe6 Merge pull request #520 from json-schema-org/ether/custom-dialect
5d23f3112 Add tests for invalid date-time past leap second
63f8e93c1 Improve leap seconds test in optional/format/date-time
3d00f593d test the use of the $vocabulary keyword in a custom metaschema

git-subtree-dir: json
git-subtree-split: ba3a9053400dd6237aef9cc63601758b1d266818

* commit '4ecbea58e0828696f7714abba624e2160518fddd':
  Squashed 'json/' changes from 54440eab4..ba3a90534