Update README.md

Author: tintinweb

README.md

@@ -10,7 +10,7 @@ An interactive Solidity shell with lightweight session recording and remote comp
 
 [💾](https://www.npmjs.com/package/solidity-shell) `npm install -g solidity-shell` 
 
-<sub><b>note:</b> may require `npm install ganache-cli` unless it is already installed :)
+<sub><b>note:</b> requires `npm install -g ganache-cli` unless it is already installed :)
 </sub>
 
 ```javascript