Update README.md

Please if you can add info that Sublime need to be opened before you run rmate command. No one wrote this information on any blogs (NOTE: you need to have opened Sublime on you local machine. If not you get this error connect_to localhost port 52698: failed.)
randy3k · Oct 10, 2018 · 6490e92 · 6490e92
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diff --git a/README.md b/README.md
@@ -53,6 +53,9 @@ ssh -R 52698:localhost:52698 user@example.com
 
 After running the server, you can just open the file on the remote system by
 
+(NOTE: you need to have opened Sublime on you local machine. 
+If not you get this error connect_to localhost port 52698: failed.)
+
 ```
 rmate test.txt
 ```