Changed Authors field

Added Authors@R with person function call

Authors@R: person(given = "Wilson",
                    family = "Freitas",
                    role = c("aut", "cre"),
                    email = "wilson.freitas@gmail.com")

DESCRIPTION

@@ -3,8 +3,10 @@ Title: Business Days Calculations and Utilities
 Description: Business days calculations based on a list of holidays and
     nonworking weekdays. Quite useful for fixed income and derivatives pricing.
 Version: 1.0.17
-Author: Wilson Freitas <wilson.freitas@gmail.com>
-Maintainer: Wilson Freitas <wilson.freitas@gmail.com>
+Authors@R: person(given = "Wilson",
+                    family = "Freitas",
+                    role = c("aut", "cre"),
+                    email = "wilson.freitas@gmail.com")
 URL: https://github.com/wilsonfreitas/R-bizdays
 VignetteBuilder: knitr
 Suggests: