Bump jxmpp to 0.7.0-alpha3
Bump jxmpp to 0.7.0-alpha3

Flowdalic/Smack,vanitasvitae/Smack,Flowdalic/Smack,igniterealtime/Smack,igniterealtime/Smack,Flowdalic/Smack,vanitasvitae/Smack,vanitasvitae/Smack,igniterealtime/Smack