add go.mod

[qbmiller]

`
module github.com/sammy007/open-ethereum-pool

go 1.18

require (
github.com/ethereum/ethash v0.0.0-20221028165206-dc3eda17d27f
github.com/ethereum/go-ethereum v1.11.2
github.com/gorilla/mux v1.8.0
github.com/yvasiyarov/gorelic v0.0.7
gopkg.in/redis.v3 v3.6.4
)

require (
github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
github.com/garyburd/redigo v1.6.4 // indirect
github.com/go-stack/stack v1.8.1 // indirect
github.com/onsi/ginkgo v1.16.5 // indirect
github.com/onsi/gomega v1.27.2 // indirect
github.com/yvasiyarov/go-metrics v0.0.0-20150112132944-c25f46c4b940 // indirect
github.com/yvasiyarov/newrelic_platform_go v0.0.0-20160601141957-9c099fbc30e9 // indirect
golang.org/x/crypto v0.1.0 // indirect
golang.org/x/sys v0.5.0 // indirect
gopkg.in/bsm/ratelimit.v1 v1.0.0-20170922094635-f56db5e73a5e // indirect
)

`