Update README.md (#879)

Added Mangata and Parallel Finance

Author: joshuacheong

README.md

@@ -102,8 +102,10 @@ _In alphabetical order_
 - [Libra](https://github.com/atscaletech/libra)
 - [Listen](https://github.com/listenofficial)
 - [Manta Network](https://github.com/Manta-Network)
+- [Mangata Finance](https://github.com/mangata-finance)
 - [Minterest](https://github.com/minterest-finance/minterest-chain-node)
 - [OAK](https://github.com/OAK-Foundation/OAK-blockchain)
+- [Parallel Finance](https://github.com/parallel-finance/)
 - [PolkaFoundry Network](https://github.com/PolkaFoundry)
 - [Setheum Network](https://github.com/Setheum-Labs/Setheum)
 - [Valiu Liquidity Network](https://github.com/valibre-org/vln-node)