Support custom delimiter

[harrybiddle]

Hey - I wanted to use your tool but I couldn't see an option to pass in a custom delimiter

[travishorn]

It should scan the first few lines of your data to auto-detect the delimiter. But allowing custom parsing configuration is a great feature idea.

One strategy for implementing this would be adding a CLI argument for specifying a config file. Then merge that configuration with the defaults found in src/parseCsv.js.

In the meantime, you could fork and modify the options for parse(). Adding something like delimiter: ";" would work.