Skip uploading Python 3.4 coverage on Appveyor#990
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Coverage 5.x has made some backwards-incompatible changes to its format and cannot understand the format generated by coverage 4.x. Since coverage 5.x does not support Python 3.4 and the "combine and upload" job is using Python 3.6 (and thus `coverage >= 5`), coverage uploading was broken. It is possible to get this working again, but probably more trouble than it is worth, since as far as I can tell there are no lines hit *only* by the Python 3.4 tests on Windows, so we can leave it out of the combined coverage measurement.
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Summary of changes
Builds have started failing on appveyor because we're using coverage 4.x to generate coverage data, but coverage 5.x to process it on Windows. This is because we're always using Python 3.6 to invoke
tox, so thecoveragejob picks up a more recent version ofcoveragethan thepy34job.As far as I can tell there are no lines uniquely hit by the Python 3.4-on-Windows tests, so we're not losing any coverage by not including it in the coverage uploads. I say it's not really worth trying to fix this, so I've just skipped the upload step on Python 3.4.
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