Fixed mocha dependency
Fixed mocha dependency

Avoids things like:
TypeError: Object #<Object> has no method 'getWindowSize'
when running mocha with mocha-multi reporter

sciyoshi/mocha-cobertura-reporter,Vanuan/mocha-cobertura-reporter,sjonnet19/mocha-cobertura-reporter,Vanuan/mocha-cobertura-reporter,sjonnet19/mocha-cobertura-reporter,sciyoshi/mocha-cobertura-reporter