remove mention of buttons
remove mention of buttons

rstacruz/nib,F4-Group/nib,ilovezy/nib,ilovezy/nib,ecmartinez/nib,ecmartinez/nib,JulianWielga/stylus-less,tj/nib,seleckis/nib-pushup,tj/nib,F4-Group/nib,seleckis/nib-pushup