Update release note for 1.0.3
Update release note for 1.0.3

wiacekm/gatling,gatling/gatling,pwielgolaski/gatling,pwielgolaski/gatling,ryez/gatling,gatling/gatling,thkluge/gatling,GabrielPlassard/gatling,timve/gatling,timve/gatling,gatling/gatling,pwielgolaski/gatling,gatling/gatling,wiacekm/gatling,wiacekm/gatling,ryez/gatling,MykolaB/gatling,ryez/gatling,thkluge/gatling,gatling/gatling,timve/gatling,GabrielPlassard/gatling,MykolaB/gatling,wiacekm/gatling,pwielgolaski/gatling,ryez/gatling,GabrielPlassard/gatling,thkluge/gatling,GabrielPlassard/gatling,thkluge/gatling,timve/gatling,MykolaB/gatling,wiacekm/gatling,MykolaB/gatling