Bump version due CRAN

HughParsonage · HughParsonage · commit 52bb1bd87c08 · 2018-01-22T08:11:45.000+11:00
diff --git a/DESCRIPTION b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: grattan
 Type: Package
 Title: Australian Tax Policy Analysis
-Version: 1.5.3.0
+Version: 1.5.3.1
 Date: 2018-01-22
 Authors@R: c(person("Hugh", "Parsonage", role = c("aut", "cre"), email = "hugh.parsonage@gmail.com"),
               person("Tim", "Cameron", role = "aut"),
