message: Added Peer4commit badge to README.md
  Added Peer4commit badge to README.md
diff: @@ -4,6 +4,8 @@ Peercoin Official Development Repo
  [![Build Status](https://travis-ci.org/peercoin/peercoin.svg?branch=master)](https://travis-ci.org/peercoin/peercoin)
  +[![tip for next commit](https://peer4commit.com/projects/19.svg)](https://peer4commit.com/projects/19)
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  ### What is Peercoin?
  [Peercoin](https://peercoin.net) (abbreviated PPC), also known as PPCoin and Peer-to-Peer Coin is the first [cryptocurrency](https://en.wikipedia.org/wiki/Cryptocurrency) design introducing [proof-of-stake consensus](https://peercoin.net/assets/paper/peercoin-paper.pdf) as a security model, with a combined [proof-of-stake](https://peercoin.net/assets/paper/peercoin-paper.pdf)/[proof-of-work](https://en.wikipedia.org/wiki/Proof-of-work_system) minting system. Peercoin is based on [Bitcoin](https://bitcoin.org), while introducing many important innovations to cryptocurrency field including new security model, energy efficiency, better minting model and more adaptive response to rapid change in network computation power.
  