Update Guzzle service provider to handle either Guzzle 5 or 6
Update Guzzle service provider to handle either Guzzle 5 or 6

GawainLynch/bolt,Raistlfiren/bolt,Intendit/bolt,Raistlfiren/bolt,cdowdy/bolt,lenvanessen/bolt,rossriley/bolt,nikgo/bolt,rossriley/bolt,romulo1984/bolt,GawainLynch/bolt,rarila/bolt,joshuan/bolt,bolt/bolt,bolt/bolt,GawainLynch/bolt,lenvanessen/bolt,CarsonF/bolt,Raistlfiren/bolt,nikgo/bolt,bolt/bolt,nikgo/bolt,CarsonF/bolt,rarila/bolt,joshuan/bolt,electrolinux/bolt,Intendit/bolt,HonzaMikula/masivnipostele,electrolinux/bolt,cdowdy/bolt,CarsonF/bolt,romulo1984/bolt,nikgo/bolt,lenvanessen/bolt,electrolinux/bolt,CarsonF/bolt,lenvanessen/bolt,HonzaMikula/masivnipostele,romulo1984/bolt,joshuan/bolt,rarila/bolt,rossriley/bolt,romulo1984/bolt,Raistlfiren/bolt,HonzaMikula/masivnipostele,rarila/bolt,bolt/bolt,cdowdy/bolt,HonzaMikula/masivnipostele,joshuan/bolt,Intendit/bolt,Intendit/bolt,cdowdy/bolt,GawainLynch/bolt,rossriley/bolt,electrolinux/bolt