Removed os: trusty (causes Travis build fail) #167
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"os: trusty" is wrong or deprecated; will cause Travis CI build to fail. Command should be "dist: trusty", but just remove line altogether and Travis will default to most currently imaged OS and insert the proper os and dist lines automatically:
[https://docs.travis-ci.com/user/trusty-to-xenial-migration-guide]
"Repositories without an explicit operating system os: key in their travis.yml file will use Linux Ubuntu Xenial 16.04."