Update readme about how to connect to riemann server using TLS.

README.md

@@ -13,6 +13,23 @@ Download from clojars: https://clojars.org/riemann-clojure-client
 (query c "state = \"ok\"")
 ```
 
+To connect to Riemann server using TLS, please refer to https://github.com/aphyr/less-awful-ssl for getting the CA certificate, signed key and cert.
+
+``` clojure
+(use 'riemann.client)
+(def c (tcp-client {:host "1.2.3.4"
+                    :port 5554
+                    :tls? true
+                    :key "client.pkcs8"
+                    :cert "client.crt"
+                    :ca-cert "ca.crt"}))
+(send-event c {:service "foo" :state "ok"})
+(query c "state = \"ok\"")
+
+```
+
+:key, :cert and :ca-cert could be any type of File, URI, URL, Socket, byte array, and String arguments. If the argument is a String, it tries to resolve it first as a URI, then as a local file name. URIs with a 'file' protocol are converted to local file names. (Check clojure.java.io/input-stream for more information.)
+
 ## License
 
 Copyright © 2012 Kyle Kingsbury

src/riemann/client.clj

@@ -96,7 +96,7 @@
   :port       The port to connect to
 
   :tls?       Whether to use TLS when connecting
-  :key        A PKCS8 key file
+  :key        A PKCS8 key 
   :cert       A PEM certificate
   :ca-cert    The signing cert for our certificate and the server's