Upgrade 1.13 to Hugo 0.57.2#16104

Merged

k8s-ci-robot merged 2 commits intokubernetes:release-1.13from zacharysarah:release-1.13

Oct 2, 2019

+20-13

Commits on Aug 28, 2019

lower case url
zacharysarah
committed

Commits on Aug 30, 2019

Make it compatible with Hugo 0.55 (kubernetes#13680 )

bep
authored and
zacharysarah
committed