when i use go get -u gopkg.in/natefinch/lumberjack.v2 it happens:
go: gopkg.in/natefinch/lumberjack.v2@v2.2.1: verifying module: gopkg.in/natefinch/lumberjack.v2@v2.2.1: checking tree#15383238 against tree#15473501: reading https://goproxy.io/sumdb/s
um.golang.org/tile/8/1/234: 404 Not Found
server response: not found
when i use
go get -u gopkg.in/natefinch/lumberjack.v2
it happens: