[ci] Update appveyor to use maven 3.5.2
[ci] Update appveyor to use maven 3.5.2

hazendaz/waffle,dblock/waffle,dblock/waffle,dblock/waffle,Waffle/waffle,hazendaz/waffle,dblock/waffle,hazendaz/waffle,Waffle/waffle,Waffle/waffle