added check leaks to mocha.opts
added check leaks to mocha.opts

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