Resolves warning raised when version is not matched.

[elyobo]

No description provided.

[Ocramius]

Could you please provide a failing test for this one?

[elyobo]

No problem. The following shows the problem; the version match is optional in the regex, so the check on line 96 may be undefined if the string doesn't contain a matching HTTP version. No idea whether that happens in practice, but you might as well handle it gracefully.

public function testRequestsWithoutHttpVersionAreOK()
{
        $requestString = "GET http://www.domain.com/index.php";
        $request = Zend\Http\Request::fromString($requestString);
}