Please up to date README.md

[ByungJun25]

Package version eg. v9, v10:

v10

Issue, Question or Enhancement:

(I am newbie in golang)

According to PR #710, the go get command doesn't work with /v10. But for me, the command with /v10 works correctly..
If I use the command on README, it will get v9 package..
Please check it. :D