README.md: fix a typo
README.md: fix a typo

jenkins: ok to test

Signed-off-by: Chen Hanxiao <818f8a165c25fa146ecad28e2ef3e3fb996fa364@gmail.com>

techtonik/lxd,jsavikko/lxd,stgraber/lxd,jsavikko/lxd,stgraber/lxd,chrisglass/lxd,yura-pakhuchiy/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,akshaykarle/lxd,dustinkirkland/lxd,ollie314/lxd,georghopp/lxd,jsavikko/lxd,Skarlso/lxd,lxc/lxd,atxwebs/lxd,hallyn/lxd,yura-pakhuchiy/lxd,chrisglass/lxd,erikmack/lxd,atxwebs/lxd,atxwebs/lxd,mjeanson/lxd,stgraber/lxd,pcdummy/lxd,dustinkirkland/lxd,hallyn/lxd,erikmack/lxd,chrisglass/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,techtonik/lxd,Skarlso/lxd,pcdummy/lxd,lxc/lxd,akshaykarle/lxd,Skarlso/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,georghopp/lxd,techtonik/lxd,hallyn/lxd,dustinkirkland/lxd,stgraber/lxd,hallyn/lxd,erikmack/lxd,ollie314/lxd,georghopp/lxd,atxwebs/lxd,pcdummy/lxd,mjeanson/lxd,akshaykarle/lxd,yura-pakhuchiy/lxd,hallyn/lxd,Skarlso/lxd,ollie314/lxd