Update README.md

https://minterteam.atlassian.net/browse/MN-524

README.md

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-Minter is a blockchain network that lets people, projects, and companies issue and manage their own coins and trade them at a fair market price with absolute and instant liquidity.
+Minter is a global rewards and loyalty points network powered by a fast blockchain. Any brand, community, or blogger can create their own coins and launch their reward or loyalty system in minutes.
 
 _NOTE: This is alpha software. Please contact us if you intend to run it in production._