update to v3.1.0

Author: sgratzl

DESCRIPTION

@@ -2,8 +2,8 @@ Package: lineupjs
 Type: Package
 Title: 'HTMLWidget' Wrapper of 'LineUp' for Visual Analysis of Multi-Attribute Rankings
 Description: 'LineUp' is an interactive technique designed to create, visualize and explore rankings of items based on a set of heterogeneous attributes. This is a 'htmlwidget' wrapper around the JavaScript library 'LineUp.js'.
-Version: 3.0.1.13
-Date: 2018-06-27
+Version: 3.1.0
+Date: 2018-07-25
 Authors@R: person("Samuel", "Gratzl", email = "[email protected]", role = c("aut", "cre"))
 Maintainer: Samuel Gratzl <[email protected]>
 URL: https://github.com/datavisyn/lineup_htmlwidget/