Update README.md

Setting user.name doesn't work with equals, even when wrapped in quotes...

Author: ppriest

README.md

@@ -45,8 +45,8 @@ git config --global core.autocrlf true
 
 And if you are contributor
 ```sh
-git config --global user.email=[email protected]
-git config --global user.name=Firstname Lastname
+git config --global user.email [email protected]
+git config --global user.name "Firstname Lastname"
 ```
 
 Then, to download the MAME source under your Msys2 user's homedir: