.travis.yml: try addons.apt.update: true for gcc-8
addons.apt.update: true
because gcc-8 setup is super unstable like this https://travis-ci.org/ruby/ruby/jobs/441528813
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65083 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Added by k0kubun (Takashi Kokubun) about 7 years ago
.travis.yml: try
addons.apt.update: truefor gcc-8because gcc-8 setup is super unstable like this
https://travis-ci.org/ruby/ruby/jobs/441528813
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65083 b2dd03c8-39d4-4d8f-98ff-823fe69b080e