fix travis icon
fix travis icon

tonytanger/builder,systemjs/builder,systemjs/builder,lookfirst/builder,buddhike/builder,jrauschenbusch/builder,whitneyit/builder,Psvensso/builder,synaptek/builder,JeroenVinke/builder,douglasduteil/builder,robwormald/builder,alexisvincent/builder,ahmedshuhel/builder,ahmedshuhel/builder,lookfirst/builder,Psvensso/builder,alexandr2110pro/builder,alexisvincent/builder,jrauschenbusch/builder,richardTowers/builder,buddhike/builder,whitneyit/builder,douglasduteil/builder,systemjs/builder,matthewbauer/builder,richardTowers/builder,alexandr2110pro/builder,JeroenVinke/builder,jrauschenbusch/builder,alexisvincent/builder,tonytanger/builder,synaptek/builder,Munter/builder,Munter/builder,robwormald/builder,matthewbauer/builder