[enh] readme: update URLs to new duniter name.

readme.md

-![Duniter logo](https://raw.github.com/ucoin-io/ucoin/master/duniter-logos/250×250.png)
+![Duniter logo](https://raw.github.com/duniter/duniter/master/duniter-logos/250×250.png)
 
-# uCoin [![Build Status](https://api.travis-ci.org/ucoin-io/ucoin.png)](https://travis-ci.org/ucoin-io/ucoin) [![Coverage Status](https://coveralls.io/repos/ucoin-io/ucoin/badge.svg?branch=master&service=github)](https://coveralls.io/github/ucoin-io/ucoin?branch=master)
+# Duniter [![Build Status](https://api.travis-ci.org/ucoin-io/ucoin.png)](https://travis-ci.org/ucoin-io/ucoin) [![Coverage Status](https://coveralls.io/repos/ucoin-io/ucoin/badge.svg?branch=master&service=github)](https://coveralls.io/github/ucoin-io/ucoin?branch=master)
 
-uCoin is a libre software allowing to create a new kind of P2P crypto-currencies based on individuals and Universal Dividend.
+Duniter (previously uCoin) is a libre software allowing to create a new kind of P2P crypto-currencies based on individuals and Universal Dividend.
 
 Inspired by [Bitcoin](https://github.com/bitcoin/bitcoin) and [OpenUDC project](https://github.com/Open-UDC/open-udc).
 
 ## Development state
 
-Software is still under development, and **no production currency using uCoin exists for now**.
+Software is still under development, and **no production currency using Duniter exists for now**.
 
-However, it already exists a testing currency named [MetaBrouzouf](http://ucoin.io/try/). Want to test it? Two ways.
+However, it already exists a testing currency named [MetaBrouzouf](http://duniter.org/try/). Want to test it? Two ways.
 
 ### Add your node to the network
 
 ```
-$ wget -qO- https://raw.githubusercontent.com/ucoin-io/ucoin/master/install.sh | bash
-$ ucoind init
-$ ucoind sync metab.ucoin.io 9201
-$ ucoind start
+$ wget -qO- https://raw.githubusercontent.com/duniter/duniter/master/install.sh | bash
+$ duniter init
+$ duniter sync metab.ucoin.io 9201
+$ duniter start
 ```
 
-and you are done! See [Install documentation](https://github.com/ucoin-io/ucoin/wiki/Install-uCoin-node) for further details.
+and you are done! See [Install documentation](https://github.com/duniter/duniter/wiki/Install-uCoin-node) for further details.
 
 ### Try Sakia Wallet
 
-In the world of crypto-currencies, [Sakia Wallet](http://sakia-wallet.org/) would be called a [SPV](https://en.bitcoin.it/wiki/Thin_Client_Security#Simplified_Payment_Verification_.28SPV.29_Clients) client. It is a graphical client connecting to the network. See this [tutorial](http://forum.ucoin.io/t/subscribing-to-meta-brouzouf-testing-currency/199) to join in the testing currency with Sakia.
+In the world of crypto-currencies, [Sakia Wallet](http://sakia-wallet.org/) would be called a [SPV](https://en.bitcoin.it/wiki/Thin_Client_Security#Simplified_Payment_Verification_.28SPV.29_Clients) client. It is a graphical client connecting to the network. See this [tutorial](https://forum.duniter.org/t/subscribing-to-meta-brouzouf-testing-currency/199) to join in the testing currency with Sakia.
 
-![](http://sakia-wallet.org/img/Dividends.png)
+![Sakia screenshot](http://sakia-wallet.org/img/Dividends.png)
 
 ## Going further
 
 ### Documentation
 
-Visit [ucoin.io](http://ucoin.io) website: it gathers theoretical informations, FAQ and several useful links. If you want to learn, this is the first place to visit.
+Visit [Duniter website](http://duniter.org): it gathers theoretical informations, FAQ and several useful links. If you want to learn, this is the first place to visit.
 
-### Talk about/get involved in uCoin project
+### Talk about/get involved in Duniter project
 
-If you wish to participate/debate on uCoin, you can:
+If you wish to participate/debate on Duniter, you can:
 
-* visit [uCoin Forum](http://forum.ucoin.io)
-* join XMPP chatroom [ucoin@muc.jappix.com](https://jappix.com/)
+* visit [Duniter Forum](http://forum.duniter.org)
+* join XMPP chatroom [duniter@muc.duniter.org](https://jappix.com/)
 * join diffusion list [https://groups.google.com/forum/?hl=fr#!forum/ucoin](https://groups.google.com/forum/?hl=fr#!forum/ucoin)
 * contact me directly at [admin@ucoin.io](mailto:admin@ucoin.io)
 
@@ -58,4 +58,4 @@ If you wish to participate/debate on uCoin, you can:
 
 # License
 
-This software is distributed under [GNU GPLv3](https://raw.github.com/ucoin-io/ucoin/master/LICENSE).
+This software is distributed under [GNU GPLv3](https://raw.github.com/duniter/duniter/master/LICENSE).