mod: tidy and vendor with Go 1.16

[mvdan]

(see commit message)

[mvdan]

Error: Please limit commit description line length to 120 characters.

... but it's an error message, copy-pasted verbatim. I think your CI check is too aggressive perhaps.

[dvyukov]

Error: Please limit commit description line length to 120 characters.

... but it's an error message, copy-pasted verbatim. I think your CI check is too aggressive perhaps.

I agree it is aggressive. But the useful question is if it's better/worse than the alternative of checking everything manually, nitpicking on PRs, forcing lots of revisions and tolerating inconsistencies in the code base in the situation where maintainer does not have time for that, lots of contributors don't have experience with Go and idea of consistent style and disappear after any comment ;)

[codecov]

Codecov Report

Merging #2459 (03eb88d) into master (fcc6d71) will increase coverage by 0.1%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
prog/target.go	60.2% <0.0%> (-5.7%)	⬇️
syz-manager/cover.go	28.6% <0.0%> (-2.2%)	⬇️
prog/rotation.go	94.9% <0.0%> (-1.7%)	⬇️
prog/prog.go	75.4% <0.0%> (-1.2%)	⬇️
prog/any.go	83.5% <0.0%> (-1.0%)	⬇️
pkg/mgrconfig/load.go	3.5% <0.0%> (-<0.1%)	⬇️
pkg/cover/cover.go	84.2% <0.0%> (ø)
pkg/report/linux.go	84.7% <0.0%> (ø)
syz-manager/html.go	0.0% <0.0%> (ø)
dashboard/app/admin.go	0.0% <0.0%> (ø)
... and 11 more