Update readme, support RTMP and AVC

Author: winlinvip

README.md

@@ -25,10 +25,10 @@ The library provides packages about network and multiple media processing:
 - [x] [errors](errors/example_test.go): Fork from [pkg/errors](https://github.com/pkg/errors), a complex error with message and stack, read [article](https://gocn.io/article/348).
 - [x] [aac](aac/example_test.go): The AAC utilities to demux and mux AAC RAW data, for oryx.
 - [x] [websocket](https://golang.org/x/net/websocket): Fork from [websocket](https://github.com/gorilla/websocket/tree/v1.2.0).
+- [x] [rtmp](rtmp/example_test.go): The RTMP protocol stack, for oryx.
+- [x] [avc](avc/example_test.go): The AVC utilities to demux and mux AVC RAW data, for oryx.
 - [ ] [sip](sip/example_test.go): A [sip RFC3261](https://tools.ietf.org/html/rfc3261) library for WebRTC signaling.
 - [ ] [turn](turn/example_test.go): A [turn RFC5766](https://tools.ietf.org/html/rfc5766) library for WebRTC and SFU.
-- [ ] [avc](avc/example_test.go): The AVC utilities to demux and mux AVC RAW data, for oryx.
-- [ ] [rtmp](rtmp/example_test.go): The RTMP protocol stack, for oryx.
 
 > Remark: For library, please never use `logger`, use `errors` instead.