Split Travis config into jobs #43
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Not worth the overhead of setting up the environment when each takes a few seconds to do the important part
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This should allow the CI to run faster by avoiding redundant stages across Python versions (no reason to run mypy, pylint, or coverage under each Python version, so just run once under nightly) and allow better parallelisation (e.g. running coverage in parallel with unit tests).
In practice it'll require fine tuning as each job has the overhead of setting up the environment (30+ seconds).
It's also quite fiddly as the jobs matrix isn't expanded over top-level python versions, so we have to do it manually with YAML aliases.