Update README

Author: stephenctw

README.md

@@ -57,7 +57,7 @@ Solidity Smart Contracts unit test harness written in Rust using the native Pari
 + Solaris can be built and has been tested with the following tools
   - Rustc 1.41.0 (5e1a79984 2020-01-27)
   - Solidity 0.5.17+commit.d19bba13.Emscripten.clang
-  - OpenEthereum EVM [stable](https://github.com/openethereum/openethereum/tree/41aee5aa2f257b99c922a0324c969493f69e71c5)
+  - OpenEthereum EVM latest [master](4b5e9ddfa66e0e5082281034b148546278c2a315)
 
 ## Known Issue