Module version mismatch

I just cloned this project and run the following commands:

```
:; npm install
:; npm start
```

And I'm seeing this error:

```
[47307:0925/150026:INFO:CONSOLE(83)] "Uncaught Error: Module version mismatch. Expected 44, got 48.", source: /Users/tnguyen/dev/levelui/node_modules/bindings/bindings.js (83)
```

I'm guessing some version is outdated? is it V8?
