Update changelog and dashr version

Author: HammadTheOne

CHANGELOG.md

@@ -2,6 +2,11 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.6.4] - 2020-07-14
+**Changed**
+- Removes warning message when an app is launched without any component ID's present in the layout (for more details, see [#457](https://github.com/plotly/dash-enterprise-docs/issues/457). 
+
+
 ## [0.6.3] - 2020-06-25
 **Changed**
 - `dash-renderer` updated to v1.5.1

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: dash
 Title: An Interface to the Dash Ecosystem for Authoring Reactive Web Applications
-Version: 0.6.3
+Version: 0.6.4
 Authors@R: c(person("Chris", "Parmer", role = c("aut"), email = "chris@plotly.com"), person("Ryan Patrick", "Kyle", role = c("aut", "cre"), comment = c(ORCID = "0000-0001-5829-9867"), email = "ryan@plotly.com"), person("Carson", "Sievert", role = c("aut"), comment = c(ORCID = "0000-0002-4958-2844")), person("Hammad", "Khan", role = c("aut"), email = "hammadkhan@plotly.com"), person(family = "Plotly Technologies", role = "cph")) 
 Description: A framework for building analytical web applications, Dash offers a pleasant and productive development experience. No JavaScript required.
 Depends: