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Remove whitespace and pass presubmit (#2217)
While running the following, noticed the whitespace warning from presubmit: ``` ubuntu@ubuntu:~/coredns$ docker run -i -t --rm -v $PWD:/go/src/github.com/coredns/coredns --net=host golang:1.11 root@ubuntu:/go# cd src/github.com/coredns/coredns/ root@ubuntu:/go/src/github.com/coredns/coredns# make ** presubmit/context ** presubmit/filename-hyphen ** presubmit/test-lowercase ** presubmit/trailing-whitespace plugin/auto/README.md:* `reload` interval to perform reload of zone if SOA version changes. Default is one minute. plugin/auto/README.md: Value of `0` means to not scan for changes and reload. eg. `30s` checks zonefile every 30 seconds plugin/file/README.md:* `reload` interval to perform reload of zone if SOA version changes. Default is one minute. plugin/file/README.md: Value of `0` means to not scan for changes and reload. eg. `30s` checks zonefile every 30 seconds ** presubmit/trailing-whitespace: please remove any trailing white space ``` Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
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