bump version; update news

cpsievert · cpsievert · commit 84eac7a34641 · 2016-03-23T12:26:02.000+11:00
diff --git a/DESCRIPTION b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: plotly
 Title: Create Interactive Web Graphics via 'plotly.js'
-Version: 3.4.7
+Version: 3.4.8
 Authors@R: c(person("Carson", "Sievert", role = c("aut", "cre"),
     email = "cpsievert1@gmail.com"),
     person("Chris", "Parmer", role = c("aut", "cph"),
diff --git a/NEWS b/NEWS
@@ -1,3 +1,9 @@
+3.4.8 -- 23 Mar 2016
+
+BUGFIX:
+
+* Safeguard against null fields in selections. See #530.
+
 3.4.7 -- 19 Mar 2016
 
 BUGFIX:
