echo command shows options in stdout

[exKAZUu]

Node version (or tell us if you're using electron or some other framework):

v9.11.1

ShellJS version (the most recent version/Github branch you see the bug on):

0.8.2

Operating system:

Windows 10

Description of the bug:

echo command shows options like -n.

Example ShellJS command to reproduce the error:

require('shelljs').echo('-n', 'no newline at end');

[exKAZUu]

Sorry, I now recognize I use an older version of shelljs and there is no issue in the latest version.