update project to use Swift5#699

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mltbnz wants to merge 7 commits into

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mltbnz:adopt-swift5-changes

Commits on Mar 31, 2020

remove redundant public access control warning
Malte Buenz
committed
set projects Swift version to 5
Malte Buenz
committed
update code to swift 5
Malte Buenz
committed
add unknown default suggestion from the compiler
Malte Buenz
committed
required to add override here
Malte Buenz
committed
bump xcode version in travis config
Malte Buenz
committed
update sim
Malte Buenz
committed