Missing response.content.text property

[larsthorup]

Hey, original author here :)

The response.content.text property was in the original code, but was deleted later: https://github.com/paulirish/request-capture-har/commit/d126270346957dafd8068e3a34756b8f3a913c37#diff-96896bf4e2c7dbc87d2341e5d07b5c26L59

This property is included, although optional, in the spec: http://www.softwareishard.com/blog/har-12-spec/#content

I need the response text in the HAR file for my auto mocking approach to work.

What do you think about adding it back in? If you are concerned about file size, we could add an option to enable this explicitly?

Thanks!