Bump codecov/codecov-action from 1.5.2 to 2.0.1 (#273)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1.5.2 to 2.0.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v1.5.2...v2.0.1)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -150,7 +150,7 @@ jobs:
             sed -i.bak "/$(echo $filename | sed 's/\//\\\//g')/d" coverage.txt
           done
         if: env.GIT_DIFF
-      - uses: codecov/codecov-action@v1.5.2
+      - uses: codecov/codecov-action@v2.0.1
         with:
           file: ./coverage.txt
         if: env.GIT_DIFF