Switch to using Travis containerised builds, update Erlang versions #507
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Overview
Travis has 2 build environments: containerised and VM based. Right now
sudo:falseselects containers, whilesudo:requiredselects the VMbased. Container-based builds guarantee 2 CPU cores and boot faster.
We've been using the latter because we needed a bunch of
apt-get installcommands. But Travis added native (non-sudo) supportto install packages in containers, and we didn't notice.
This PR switches us to
sudo:falseand uses the newaptblock toinstall required packages.
The PR also updates our Erlang build matrix, using the latest minor
release of each major version we support, and prepares us to enable
IRC notifications to
#couchdb-devonce the test suite is reliableagain (currently disabled.)
Testing recommendations
Check the Travis build results on this PR. It is passing.