update news/desc

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: AzureRMR
 Title: Interface to 'Azure Resource Manager'
-Version: 2.1.2.9000
+Version: 2.1.3
 Authors@R: c(
     person("Hong", "Ooi", , "hongooi@microsoft.com", role = c("aut", "cre")),
     person("Microsoft", role="cph")

NEWS.md

@@ -1,7 +1,8 @@
-# AzureRMR 2.1.2.9000
+# AzureRMR 2.1.3
 
 - Fix a bug where failure to create a resource would not be detected.
 - Make setting tags more robust (some resources return a null tags field when no tags are present, rather than an empty object).
+- Better handling of null fields for all REST calls.
 
 # AzureRMR 2.1.2