Example in README does not work #16

> var knex = require('feathers-knex');
undefined
> var todos = knex('todos', {
...   dialect: 'sqlite3',
...   connection: {
.....     filename: './data.db'
.....   }
... });
TypeError: knex is not a function
    at repl:1:13
    at REPLServer.defaultEval (repl.js:164:27)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.<anonymous> (repl.js:393:12)
    at emitOne (events.js:82:20)
    at REPLServer.emit (events.js:169:7)
    at REPLServer.Interface._onLine (readline.js:210:10)
    at REPLServer.Interface._line (readline.js:549:8)
    at REPLServer.Interface._ttyWrite (readline.js:826:14)
    at ReadStream.onkeypress (readline.js:105:10)
    at emitTwo (events.js:87:13)
    at ReadStream.emit (events.js:172:7)
    at emitKeys (readline.js:1250:14)
    at next (native)
    at ReadStream.onData (readline.js:918:36)