Update doi

DESCRIPTION

@@ -8,7 +8,7 @@ Authors@R:  c(
     person("Danial", "Mazarei", email = "danial.mazarei@gmail.com", role = "aut", comment = c(ORCID = "0000-0002-3633-9298")),
     person("FCT, I.P.", role = "fnd", comment = c("under the scope of the projects UIDB/00297/2020 and UIDP/00297/2020 (NovaMath)")))
 Maintainer: Ricardo Moura <rp.moura@fct.unl.pt>
-Description:  Considering the singly imputed synthetic data generated via plug-in sampling under the multivariate normal model, draws inference procedures including the generalized variance, the sphericity test, the test for independence between two subsets of variables, and the test for the regression of one set of variables on the other. For more details see Klein et al. (2021) <DOI: 10.1007/s13571-019-00215-9>.
+Description:  Considering the singly imputed synthetic data generated via plug-in sampling under the multivariate normal model, draws inference procedures including the generalized variance, the sphericity test, the test for independence between two subsets of variables, and the test for the regression of one set of variables on the other. For more details see Klein et al. (2021) <doi: 10.1007/s13571-019-00215-9>.
 License: GPL (>= 2)
 URL: https://github.com/ricardomourarpm/PSinference
 Imports: MASS, stats