Merge pull request #35 from ipfs/gomod

add gomod support // tag v0.0.1.

.travis.yml

+os:
+  - linux
+
+language: go
+
+go:
+  - 1.11.x
+
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gx
+    - BUILD_DEPTYPE=gomod
+
+
+# disable travis install
+install:
+  - true
+
+script:
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+
+cache:
+  directories:
+    - $GOPATH/src/gx
+    - $GOPATH/pkg/mod
+    - $HOME/.cache/go-build
+
+notifications:
+  email: false

go.mod

+module github.com/ipfs/go-merkledag
+
+require (
+	github.com/gogo/protobuf v1.2.1
+	github.com/ipfs/go-block-format v0.0.2
+	github.com/ipfs/go-blockservice v0.0.1
+	github.com/ipfs/go-cid v0.0.1
+	github.com/ipfs/go-datastore v0.0.1
+	github.com/ipfs/go-ipfs-blockstore v0.0.1
+	github.com/ipfs/go-ipfs-exchange-offline v0.0.1
+	github.com/ipfs/go-ipfs-util v0.0.1
+	github.com/ipfs/go-ipld-cbor v0.0.1
+	github.com/ipfs/go-ipld-format v0.0.1
+	github.com/multiformats/go-multihash v0.0.1
+)