Update README.md
Added fullscreen support for X11
Changed is_fullscreen to monitor.is_some()
Get the monitors attached to the display, and their resolution for X11
Added fullscreen support for X11
Changed is_fullscreen to monitor.is_some()
Get the monitors attached to the display, and their resolution for X11
Added output to get_name for x11 monitors
Add libXxf86vm-dev installation to travis.yml
Merge pull request #38 from tomaka/x11_fullscreen

X11 fullscreen