[CI] Test with Xcode 10.2
[CI] Test with Xcode 10.2

twobitlabs/Nimble,AnthonyMDev/Nimble,Quick/Nimble,phatblat/Nimble,twobitlabs/Nimble,AnthonyMDev/Nimble,phatblat/Nimble,phatblat/Nimble,twobitlabs/Nimble,Quick/Nimble,Quick/Nimble,AnthonyMDev/Nimble