bump version; update news

cpsievert · cpsievert · commit 56230e45203a · 2016-05-31T14:34:37.000+10:00
diff --git a/DESCRIPTION b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: plotly
 Title: Create Interactive Web Graphics via 'plotly.js'
-Version: 3.6.3
+Version: 3.6.4
 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 @@
+3.6.4 -- 31 May 2016
+
+BUG FIX:
+
+embed_notebook() will no longer use a '.embed' extension in the iframe src attribute. See #613.
+
 3.6.3 -- 24 May 2016
 
 CHANGES:
