doc: update hledger-irr mention

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Simon Michael 2018-10-12 07:21:37 -07:00
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@ -56,7 +56,8 @@ generates interest transactions for an account according to various schemes.
### irr
[hledger-irr](http://hackage.haskell.org/package/hledger-irr)
calculates the internal rate of return of an investment account.
calculates the internal rate of return of an investment account,
but it's superseded now by the built-in [roi](#roi) command.
## Experimental add-ons