Import store package in main.go
Import store package in main.go

This is needed to ensure that dependencies of the store package are installed
with `go get` so that `go test ./store` can be run.

ke7ofi/elvish,elves/elvish,ke7ofi/elvish,beni55/elvish,elves/elvish,CodyGuo/elvish,elves/elvish,beni55/elvish,elves/elvish,elves/elvish,CodyGuo/elvish