env parameter should be rounded by double-quotation

Warning occurs when you run the following command in Windows when you are setting up a 'SLIMERJSLAUNCHER' ​​environment variable.

    > slimerjs --version
    'Program ' is not recognized as an internal or external command, operable program or batch file.

This is caused by the 'SLIMERJSLAUNCHER' ​​without double quotes is running at Line 110.
You should assign the environment variable with double quotes when defining the 'SLIMERJSLAUNCHER'.