Fix: file name .dockerignore has blank

[sanposhiho]

Hello team.
.dockerignore has blank on its filename and git cannot checkout successfully on windows.

Thanks for reporting, @warmchang.

#8 (comment)

[sanposhiho]

/kind bug

[adtac]

The file is still empty? Did you mean to add a newline? I don't see it in the diff

[sanposhiho]

@adtac
It looks like there is no change, but actually the file name has been changed :)

.dockerignore (two whitespaces after name) → .dockerignore (delete two whitespaces)

(You can tell from the URL that it contains two whitespaces (%20%20).)
https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/.dockerignore%20%20

[sanposhiho]

@adtac ping

[sanposhiho]

/label tide/merge-method-squash

[Huang-Wei]

/lgtm

[Huang-Wei]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Huang-Wei, sanposhiho

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