CI: Fix coverage-report.py on Python3

5 jobs for v0.3 in 48 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #14288
py27_django110

00:00:08

passed #14289
py27_django111

00:00:09

passed #14286
py27_django18

00:00:09

passed #14287
py27_django19

00:00:08

passed #14290
py34_django111

00:00:12

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