[fix] README typo

README.md

@@ -27,7 +27,7 @@ Then open `localhost:8080` in a supported browser.
 
 ### Change port
 
-If you are already using port `8080` for your development, you can change the port by modifying `package.json` file as follows :
+If you are already using port `8080` for your developments, you can change the port by modifying `package.json` file as follows :
 
 In the `scripts` section, modify the `start` command: