doesn't work with ES6 (via babel-node)

[bcherny]

static is a reserved word in ES6, so import static from 'koa-static' fails to transpile:

> babel-node --harmony index.js

/Users/boris/foobar/node_modules/babel/node_modules/babel-core/lib/babel/helpers/parse.js:80
    throw err;
          ^
SyntaxError: /Users/boris/foobar/index.js: The keyword 'static' is reserved (4:7)
  3 | import route from 'koa-route'
> 4 | import static from 'koa-static'

related to #32

[bcherny]

for anyone that has this issue in the future, the solution is simpler than i thought - just implicitly alias the module name:

import koaStatic from 'koa-static'

es6 doesn't care what you call a module's default export.