Update CHANGELOG.md
Update CHANGELOG.md

Remove duplicated commit.
DrumTechnologiesLtd/JsSIP,rusekr/JsSIP,onsip/SIP.js,vconsult/JsSIP,joseph-onsip/SIP.js,ronlobo/SIP.js,onsip/SIP.js,markandrus/SIP.js,josephfrazier/SIP.js,Escaux/SIP.js,AaronZhangL/JsSIP,Voiceworks/SIP.js,dpocock/JsSIP,voxbone/JsSIP,tqcenglish/JsSIP,CodeYellowBV/JsSIP