README: various minor fixes
README: various minor fixes

kelcecil/flannel,bprashanth/flannel,imzhulei/flannel,jonboulle/flannel,kelcecil/flannel,lvlv/flannel,EverythingMe/flannel,endocode/flannel,Yhgenomics/flannel,coreos/flannel,MohdAhmad/flannel,bprashanth/flannel,ingvagabund/flannel,wikimedia/operations-debs-flannel,imzhulei/flannel,wikimedia/operations-debs-flannel,endocode/flannel,EverythingMe/flannel,cusspvz/flannel,imzhulei/flannel,wikimedia/operations-debs-flannel,jonboulle/flannel,eyakubovich/flannel,coreos/flannel,ingvagabund/flannel,Yhgenomics/flannel,Yhgenomics/flannel,adiclepcea/flannel,sujitfulse/flannel,MohdAhmad/flannel,cusspvz/flannel,sujitfulse/flannel,coreos/flannel,sujitfulse/flannel,eyakubovich/flannel,cusspvz/flannel,svdata/flannel,EverythingMe/flannel,lihuanghai/flannel,lvlv/flannel,kelcecil/flannel,svdata/flannel,lihuanghai/flannel,dcbw/flannel,lvlv/flannel,adiclepcea/flannel,endocode/flannel,adiclepcea/flannel,jonboulle/flannel,lihuanghai/flannel,svdata/flannel,eyakubovich/flannel,ingvagabund/flannel,MohdAhmad/flannel,dcbw/flannel,dcbw/flannel,bprashanth/flannel