Upload coverage in xml format

codecov docs say that xml is supported and explicitly call out Python ".coverage" format as unsupported. https://docs.codecov.io/docs/supported-report-formats

Upload coverage in xml format
cee08f73 · Jean-Paul Calderone · 7751c54b · cee08f73
Unverified Commit cee08f73 authored 5 years ago by Jean-Paul Calderone
--- a/.circleci/report-coverage.sh
+++ b/.circleci/report-coverage.sh
@@ -3,4 +3,5 @@
 cp ./result-doc/share/doc/*/.coverage ./
 python -m coverage combine .coverage
 python -m coverage report
-codecov --file .coverage
+python -m coverage xml
+codecov --file coverage.xml