Use known-good osx_image for old Rubies #536
Merged
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Summary
Fix the build for Ruby 2.0.0 and 1.9.3 on OSX.
Details
Ruby 2.0.0 and 1.9.3 cannot be installed on the default Travis CI OS X images. Use the xcode8 image instead, which uses OS X version 10.11 and Xcode version 8gm.
Motivation and Context
These builds were ignored and continuously failing, almost at the start of the build, making them effectively useless.
How Has This Been Tested?
These settings yielded succesful builds in the experimental pull request #534.
Types of changes