tree aa33184c9a91372b2bf4916d59934a6d4a5c49fd
parent a016a082a8143409006d954112b5130bc7e9449c
author Chris Dickens <christopher.a.dickens@gmail.com> 1604948470 -0800
committer Chris Dickens <christopher.a.dickens@gmail.com> 1604948470 -0800

travis: Update build environments

Add Ubuntu's Focal distribution to get the latest Linux toolchain.

Add Xcode 12.2 to get the latest MacOS toolchain.

Remove Xcode 7.3 as it is now obsolete and will not successfully build.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>