Got rid of session interface and made session struct exported

rtmp/rtmp.go

@@ -215,15 +215,8 @@ var RTMPProtocolStringsLower = [...]string{
 	"rtmfp",
 }
 
-// Session provides an interface for sending flv tags over rtmp.
-type Session interface {
-	Open() error
-	Write([]byte) (int, error)
-	Close() error
-}
-
 // session provides parameters required for an rtmp communication session.
-type session struct {
+type Session struct {
 	rtmp    *C.RTMP
 	url     string
 	timeout uint