fix: do not fatal on automaxprocs error (#3946)

This might fail on windows/wsl (see
uber-go/automaxprocs#65), and its not too bad
if it fails, actually, so, let's just warn the error instead of exiting
1

closes #3945



Signed-off-by: Carlos Alexandro Becker
<caarlos0@users.noreply.github.com>

---------

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

main.go

@@ -29,7 +29,8 @@ func init() {
 	// automatically set GOMAXPROCS to match available CPUs.
 	// GOMAXPROCS will be used as the default value for the --parallelism flag.
 	if _, err := maxprocs.Set(); err != nil {
-		log.WithError(err).Fatal("failed to set GOMAXPROCS")
+		// might fail on WSL...
+		log.WithError(err).Warn("failed to set GOMAXPROCS")
 	}
 }