Document SSL options

Author: hamishforbes

README.md

@@ -131,6 +131,18 @@ Available user configurations are listed as follows:
 
     Periodic flush interval (in seconds). Set to `nil` to turn off this feature.
 
+* `ssl`
+
+    Boolean, enable or disable connecting via SSL. Default to false.
+
+* `ssl_verify`
+
+    Boolean, enable or disable verifying host and certificate match. Default to true.
+
+* `sni_host`
+
+    Set the hostname to send in SNI and to use when verifying certificate match.
+
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