bump for release

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: AzureRMR
 Title: Interface to 'Azure Resource Manager'
-Version: 2.3.0.9000
+Version: 2.3.1
 Authors@R: c(
     person("Hong", "Ooi", , "hongooi@microsoft.com", role = c("aut", "cre")),
     person("Microsoft", role="cph")

NEWS.md

@@ -1,4 +1,4 @@
-# AzureRMR 2.3.0.9000
+# AzureRMR 2.3.1
 
 - Update Resource Manager API version to "2019-10-01".
 - Export `get_paged_list` utility function.