'\\' followed by '\"' incorrectly produces a parse error

[sysread]

Minimal test case:

my $parser = TOML::Parser->new;
chomp(my $toml = <DATA>);
my $data = $parser->parse($toml);
__DATA__
foo="bar=\\\"baz\\\""

This should produce a string value for foo of bar=\"baz\". The syntax is correct, with an escaped slash, \\, followed by an escaped quote, \".

Instead, TOML::Parser produces an error:

Syntax Error: line:1
foo="bar=\\"baz\\"" 
           ^

Separating the two slash-escaped characters avoids the spurious error:

__DATA__
foo="bar=\\ \"baz\\ \""

[sysread]

I have just sent a PR with a fix for this issue: #18