Preserve user environment
Preserve user environment

Some child processes executed with this module might benefit from being
able to read their parent process environment variables.

Fixes: https://github.com/jorangreef/sudo-prompt/issues/20
Signed-off-by: Juan Cruz Viotti <8493db2a4f45d66df375afe12f7eba59fe1c8d78@gmail.com>

jorangreef/sudo,jorangreef/sudo-prompt