Added ArangoDB Oasis to USERS list.
Added ArangoDB Oasis to USERS list.

Signed-off-by: Ewout Prangsma <638f134dbc68778d6b859fb04a64baea2b00b021@arangodb.com>

michi-covalent/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium