Bump version number to 0.1.19

Author: andrie

DESCRIPTION

@@ -16,13 +16,14 @@ Description: This is a set of tools for dendrograms and
     functions that extract the dendrogram plot data. The package
     provides implementations for tree, rpart, as well as diana and agnes
     cluster diagrams.
-Version: 0.1-18
+Version: 0.1-19
 URL: https://github.com/andrie/ggdendro
 BugReports: https://github.com/andrie/ggdendro/issues
-Date: 2016-02-25
+Date: 2016-04-14
 Imports:
     MASS,
-    ggplot2(>= 0.9.2)
+    ggplot2(>= 0.9.2),
+    scales
 Suggests:
     rpart(>= 4.0-0),
     tree,