Use go modules and move main to cmd subdir

Signed-off-by: p4u <p4u@dabax.net>

go.mod

@@ -0,0 +1,29 @@
+module github.com/vocdoni/dvote-relay
+
+require (
+	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
+	github.com/btcsuite/btcd v0.0.0-20190115013929-ed77733ec07d // indirect
+	github.com/gogo/protobuf v1.2.0 // indirect
+	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
+	github.com/gxed/hashland v0.0.0-20180221191214-d9f6b97f8db2 // indirect
+	github.com/ipfs/go-ipfs-api v1.3.5
+	github.com/ipfs/go-ipfs-cmdkit v1.1.3 // indirect
+	github.com/libp2p/go-flow-metrics v0.2.0 // indirect
+	github.com/libp2p/go-libp2p-crypto v2.0.1+incompatible // indirect
+	github.com/libp2p/go-libp2p-metrics v2.1.7+incompatible // indirect
+	github.com/libp2p/go-libp2p-peer v2.4.0+incompatible // indirect
+	github.com/libp2p/go-libp2p-protocol v1.0.0 // indirect
+	github.com/libp2p/go-libp2p-pubsub v0.11.10 // indirect
+	github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1 // indirect
+	github.com/minio/sha256-simd v0.0.0-20190108234304-79eac576c45d // indirect
+	github.com/mitchellh/go-homedir v1.0.0 // indirect
+	github.com/mr-tron/base58 v1.1.0 // indirect
+	github.com/multiformats/go-multiaddr v1.4.0 // indirect
+	github.com/multiformats/go-multiaddr-dns v0.2.5 // indirect
+	github.com/multiformats/go-multiaddr-net v1.7.1 // indirect
+	github.com/multiformats/go-multihash v1.0.8 // indirect
+	github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72 // indirect
+	github.com/syndtr/goleveldb v0.0.0-20181128100959-b001fa50d6b2
+	github.com/whyrusleeping/tar-utils v0.0.0-20180509141711-8c6c8ba81d5c // indirect
+	golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
+)

go.sum

@@ -0,0 +1,78 @@
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