adrienverge / yamllint / 28223239710

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truthy: Don't carry %YAML version into the next document

A `%YAML` directive applies only to the document it introduces, but the
rule only reset its cached spec version on a `...` DocumentEndToken. When
documents are separated by `---` alone (no `...`), the version of the
previous document leaked into the next one, which has no directive of its
own and should be treated as YAML 1.1:

    %YAML 1.2
    ---
    on: 1
    ---
    on: 2

The second `on` is a YAML 1.1 truthy value and should be flagged, but the
leaked 1.2 version suppressed it.

Reset the cached version when a `---` marker starts a document that has no
directive of its own (a directive always precedes the marker), so every
document is linted against its own spec version.

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