update centrifuge-go to 0.5.2, support NamedRPC

Author: FZambia

Gopkg.lock

@@ -27,7 +27,7 @@
 
 [[constraint]]
   name = "github.com/centrifugal/centrifuge-go"
-  version = "0.5.0"
+  version = "0.5.2"
 
 [prune]
   go-tests = true

Gopkg.toml

@@ -80,6 +80,11 @@ func (c *Client) RPC(data []byte) ([]byte, error) {
 	return c.client.RPC(data)
 }
 
+// NamedRPC allows to make RPC with method.
+func (c *Client) NamedRPC(method string, data []byte) ([]byte, error) {
+	return c.client.NamedRPC(method, data)
+}
+
 // Close closes Client connection and cleans ups everything.
 func (c *Client) Close() error {
 	return c.client.Close()