travis: temporary downgrade mac builds to qt5.5 (#3066)

`qt@5.7` is no longer available: https://github.com/Homebrew/homebrew-core/pull/23165#issuecomment-362270835
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tooomm 2018-02-01 19:09:46 +01:00 committed by GitHub
parent c1bd50f186
commit 3e418ba3c6
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@ -2,7 +2,7 @@
if [[ $TRAVIS_OS_NAME == "osx" ]] ; then
brew update
brew install ccache clang-format protobuf qt@5.7
brew install ccache clang-format protobuf qt@5.5
fi
if [[ $TRAVIS_OS_NAME == "linux" ]] ; then
echo Skipping... packages are installed with the Travis apt addon for sudo disabled container builds