Cannot find package github.com/gocolly/colly

[SimonBard]

I get the following error message:

main.go:10:2: cannot find package "github.com/gocolly/colly" in any of:
/usr/lib/go-1.11/src/github.com/gocolly/colly (from $GOROOT)
/root/go/src/github.com/gocolly/colly (from $GOPATH)

I tried to install colly with
go get -u github.com/gocolly/colly/...

but failed.

[cupuyc]

I found the tip in another repo gocolly/colly#475.
Run this before installation
go mod init github.com/luckylittle/blinkist-m4a-downloader