Devfeel/develop#90

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chacha923 wants to merge 7 commits intodevfeel:developfrom

chacha923:devfeel/develop

Commits on Nov 22, 2017

Update README.md
devfeel
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Commits on Dec 5, 2017

Change etcd client depend on etcd offical client v3, implement simple
chacha923
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Commits on Dec 6, 2017

modified etcdutil_test.go, etcdutil only support go1.9+
chacha923
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