It looks like 1a1a820569f0883a317944973c15cf34431dd6c2 actually broke
codecov. Codecov is currently trying to diff all PRs against the commit
before that one, which leads to flagging previously-added lines of code
as needing coverage in the current PR.
Let's try removing the token and see if codecov is happy again.
Fixes#1124
No change to logic. This updates nyc (code coverage tool) to version 15,
which works around a breaking change that snuck into the latest Node LTS
versions.
Unfortunately, this version of nyc appears to break Node 8 and 9. We
need to work around this problem by skipping test coverage on those
versions.
Fixes#1130
