Changing ^M chars to semicolons

Thanks for this tool - it's a huge help for me.

In order to get migrations to work in my environment (MacOSX Mavericks, Rails 4.1.5, Ruby 2.1.2p95), I needed to change all instances of the `^M` character with a semicolon instead. Otherwise I would get the following error, and no migrations would run:

```
$ git checkout master
Switched to branch 'master'
Running migrations!
(irb):1: warning: encountered \r in middle of line, treated as a mere space
```

Hope this patch helps.