added coverage dir to gitignore
added coverage dir to gitignore

wpensar/ionic-orm,BradyLiles/ionic-orm,Luke265/typeorm,wpensar/ionic-orm,cserron/typeorm,typeorm/typeorm,typeorm/typeorm,Luke265/typeorm,wpensar/ionic-orm,BradyLiles/ionic-orm,gintsgints/typeorm,gintsgints/typeorm,ReaxDev/typeorm,typeorm/typeorm,ReaxDev/typeorm,cserron/typeorm