Bump the requirement for XML::Sig to 0.66

0.65 returns an error which does not exist in 0.66. Which seem to be
related to Crypt::OpenSSL::RSA disabling use_pkcs1_padding.

Signed-off-by: Wesley Schwengle <waterkip@cpan.org>

Author: waterkip

dist.ini

@@ -57,7 +57,7 @@ skip = feature
 [Prereqs / RuntimeRequires]
 perl = 5.014
 XML::Enc = 0.13
-XML::Sig = 0.64
+XML::Sig = 0.66
 ; Here because it isn't provided by Crypt::OpenSSL::RSA
 Crypt::OpenSSL::Bignum = 0
 URN::OASIS::SAML2 = 0.004