Add LifChannels contract in README.md 🌈

Author: AugustoL

README.md

@@ -24,6 +24,7 @@ npm install
 - [SmartToken](blob/master/contracts/SmartToken.sol): Token based in the ERC20 standard with extra methods to transfer value and data and execute a call on transfer. Uses OpenZeppelin StandardToken.
 - [LifToken](blob/master/contracts/LifToken.sol): Smart token for the Winding Tree platform.
  Uses SmartToken and OpenZeppelin MintableToken and Pausable contracts.
+ - [LifChannels](blob/master/contracts/LifChannels.sol): Implementation of simple state channels for Lif token holders.
 - [LifCrowdsale](blob/master/contracts/LifCrowdsale.sol): Implementation of the Lif Token Generation Event (TGE)
   Crowdsale: A 2 week fixed price, uncapped token sale, with a discounted rate for contributions during the private
   presale and a Market Validation Mechanism that will receive the funds over the USD 10M soft cap.