Update travis configuration
Update travis configuration

use sudo: false to enable container build
use cache: pip to cache pip packages

syci/website-odoo,Endika/website,pedrobaeza/website,BT-fgarbely/website,Yajo/website,khaeusler/website,nicolas-petit/website,BT-jmichaud/website,BT-jmichaud/website,Yajo/website,kaerdsar/website,nuobit/website,BT-ojossen/website,xpansa/website,gfcapalbo/website,BT-fgarbely/website,Rona111/website,Rona111/website,acsone/website,syci/website-odoo,RoelAdriaans-B-informed/website,Yajo/website,LasLabs/website,Endika/website,BT-ojossen/website,open-synergy/website,Endika/website,open-synergy/website,nuobit/website,Antiun/website,khaeusler/website,syci/website-odoo,brain-tec/website,Antiun/website,Yajo/website,nuobit/website,BT-ojossen/website,RoelAdriaans-B-informed/website,gfcapalbo/website,JayVora-SerpentCS/website,nicolas-petit/website,xpansa/website,nuobit/website,AuyaJackie/website,incaser/website,xpansa/website,BT-jmichaud/website,Tecnativa/website,open-synergy/website,LasLabs/website,Tecnativa/website,gfcapalbo/website,pedrobaeza/website,RoelAdriaans-B-informed/website,pedrobaeza/website,Antiun/website,LasLabs/website,pedrobaeza/website,JayVora-SerpentCS/website,incaser/website,BT-fgarbely/website,gfcapalbo/website,StefanRijnhart/website,brain-tec/website,brain-tec/website,incaser/website,Tecnativa/website,kaerdsar/website,AuyaJackie/website,open-synergy/website,RoelAdriaans-B-informed/website,Rona111/website,Antiun/website,khaeusler/website,StefanRijnhart/website,LasLabs/website,acsone/website,nicolas-petit/website,StefanRijnhart/website,kaerdsar/website,acsone/website,AuyaJackie/website,xpansa/website,acsone/website,brain-tec/website,Endika/website,JayVora-SerpentCS/website