ETH transactions (pre-ETC fork), showing as ETC chain not ETH chain

[nanonano]

Firstly thank you so much for building this awesome tool, I'm currently trying to integrate it with BittyTax using the CSV transactions export.

One thing I noticed during testing was that if you have ETH transactions which were pre-fork (ETC), i.e. before 20th July 2016, they are appearing in CSV file as being on the ETC chain not the ETH chain.

I've attached an example:

transactions-ETH as ETC.csv

As you can see, before the fork, as expected transactions are duplicated, one for ETH and one for ETC, but the chain says ETC for them both.