Php-parser: nowdoc have unnecessary property `quote`

[alexander-akait]

The nowdoc syntax should be always use ' quotes, so this property is unnecessary.

[ichiriac]

Nowdoc node is used with heredoc, and heredoc can use " or without any quote - https://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc - the solution could be to create a new node heredoc with a quote property (as a boolean).

[alexander-akait]

Right now we have nowdoc ast node where we have quote property, but we don't need this property because nowdow always require single quotes '

[alexander-akait]

Fixed in prettier branch and will be merged in future (i hope)