Update dependencies

[BenTheElder]

for the main kind CLI
will approach kindnetd carefully in a different PR at some point

EDIT:

• switch to go-isatty which is a better scoped for checking if a file is a tty than x/crypto (and has version tags...)
• drop superfluous uuid dependency, just use the timestamp and a random int for naming the node build container

[aojea]

/lgtm

[BenTheElder]

updated to cleanup the deps a bit (updated the PR body to describe)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, tao12345666333

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[tao12345666333]

👍

[BenTheElder]

[bentheelder@bentheelder-macbookpro:~/go/src/sigs.k8s.io/kind·2019-11-07T01:40:49-0800·master@f56b2cb]
$ kind version
kind v0.6.0-alpha+f56b2cbad927a5 go1.13.4 darwin/amd64

[bentheelder@bentheelder-macbookpro:~/go/src/sigs.k8s.io/kind·2019-11-07T01:40:51-0800·master@f56b2cb]
$ du -h $(which kind)
8.8M    /Users/bentheelder/go/bin/kind

:-)

dropped another half megabyte somewhere in here as a side effect, nice bonus!