correct dashboard package name (#551)

README.md

@@ -227,7 +227,7 @@ services.AddCap(x =>
 CAP v2.1+ provides the dashboard pages, you can easily view the sent and received messages. In addition, you can also view the  message status in real time on the dashboard. Use the  following command to install the Dashboard in your project.
 
 ```
-PM> Install-Package DotNetCore.Dashboard
+PM> Install-Package DotNetCore.CAP.Dashboard
 ```
 
 In the distributed environment, the dashboard built-in integrated [Consul](http://consul.io) as a node discovery, while the realization of the gateway agent function, you can also easily view the node or other node data, It's like you are visiting local resources.

README.zh-cn.md

@@ -242,7 +242,7 @@ CAP 2.1+ 以上版本中提供了仪表盘（Dashboard）功能，你可以很
 使用一下命令安装 Dashboard：
 
 ```
-PM> Install-Package DotNetCore.Dashboard
+PM> Install-Package DotNetCore.CAP.Dashboard
 ```
 
 在分布式环境中，仪表盘内置集成了 [Consul](http://consul.io) 作为节点的注册发现，同时实现了网关代理功能，你同样可以方便的查看本节点或者其他节点的数据，它就像你访问本地资源一样。