use git://github.com/FredericHeem/koa-66#91af44c3c446a5b3b9677172bdcdea713b10dca2 koa-66 url to get around authentication issue on travis build
use git://github.com/FredericHeem/koa-66#91af44c3c446a5b3b9677172bdcdea713b10dca2 koa-66 url to get around authentication issue on travis build

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