Simplify docker example in readme since there is an "official" image now

README.md

@@ -5,6 +5,7 @@ WowPacketParser (WPP)
 [![Coverity Scan Build Status](https://img.shields.io/coverity/scan/2618.svg?style=flat-square)](https://scan.coverity.com/projects/2618)
 [![Build Status TravisCI](https://img.shields.io/travis/TrinityCore/WowPacketParser/master.svg?style=flat-square)](https://travis-ci.org/TrinityCore/WowPacketParser)
 [![Build Status AppVeyor](https://img.shields.io/appveyor/ci/DDuarte/wowpacketparser-191/master.svg?style=flat-square)](https://ci.appveyor.com/project/DDuarte/wowpacketparser-191)
+[![Docker Pulls](https://img.shields.io/docker/pulls/trinitycore/wpp.svg?style=flat-square)](https://hub.docker.com/r/trinitycore/wpp/)
 
 Usage
 -----
@@ -55,10 +56,12 @@ Nightly Builds
 Docker (experimental)
 ---------------------
 
-It is possible run WPP on Docker by running the following commands:
+It is possible run WPP on Docker using the `trinitycore/wpp` image:
 
-- Build the image: `docker build -t wpp .`
-- Run it: `docker run -it --rm -v /place/where/sniffs/are/kept:/usr/src/app/build/sniffs wpp:latest sniffs/sniffname.pkt # Run`
+```
+docker run -v /place/where/sniffs/are/kept:/usr/src/app/build/sniffs trinitycore/wpp sniffs/sniffname.pkt
+```
 
 */place/where/sniffs/are/kept* should your local directory containing the .pkt file and *sniffname.pkt* the file to be parsed.
-Output of the parser will be added to */place/where/sniffs/are/kept*
+
+Output (.txt/.sql) of the parser will be added to */place/where/sniffs/are/kept*.