don't report standalone colon in mapping value

[xabbuh]

Colons in mapping values are fine as long as they are not followed by a
space character.

[xabbuh]

see symfony/symfony-docs#6604

[xabbuh]

Hm, looks like something's still going wrong with my tests.

[stof]

I think the YAML parser used by PHPStorm does not parse foo: bar: test as foo: 'bar: test' but as foo: {bar: test} (which cannot be considered as a bug, as the YAML spec does not define how parsers should fallback for invalid input, unlike HTML5, and so the parser is accepting a different kind of value here). This probably mean that it never sees a bar: test unquoted value (meaning that the detection of the deprecation might be much harder to implement)

[Haehnchen]

yes, PhpStorm parse it in a different way, but some whitelist magic helps here