Update README.md

Added the MinerCircle pool to the list of pools supporting xmr-node-proxy.

Author: MinerCircle

README.md

@@ -73,5 +73,6 @@ Known Working Pools
 * [XMRPool.xyz](https://xmrpool.xyz)
 * [ViaXMR.com](https://viaxmr.com)
 * [mine.MoneroPRO.com](https://mine.moneropro.com)
+* [MinerCircle.com](https://www.minercircle.com)
 
 If you'd like to have your pool added, please make a pull request here, or contact Snipa on IRC!