add go.mod and update travis.

.travis.yml

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

go.mod

+module github.com/libp2p/go-libp2p-peerstore
+
+require (
+	github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7 // indirect
+	github.com/Kubuxu/go-os-helper v0.0.0-20161003143644-3d3fc2fb493d // indirect
+	github.com/dgraph-io/badger v1.5.4 // indirect
+	github.com/dgryski/go-farm v0.0.0-20190104051053-3adb47b1fb0f // indirect
+	github.com/go-check/check v0.0.0-20180628173108-788fd7840127 // indirect
+	github.com/gogo/protobuf v1.2.1
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/hashicorp/golang-lru v0.5.1
+	github.com/ipfs/go-datastore v0.0.0-20190207190025-057884927798
+	github.com/ipfs/go-ds-badger v0.0.0-20190218174214-7d5e050ec3cd
+	github.com/ipfs/go-ds-leveldb v0.0.0-20190207190115-d9761ea1cccd
+	github.com/ipfs/go-log v0.0.0-20190218133459-8924f37936b0
+	github.com/jbenet/goprocess v0.0.0-20160826012719-b497e2f366b8 // indirect
+	github.com/kr/pretty v0.1.0 // indirect
+	github.com/libp2p/go-buffer-pool v0.0.1
+	github.com/libp2p/go-libp2p-crypto v0.0.1
+	github.com/libp2p/go-libp2p-peer v0.0.1
+	github.com/mattn/go-colorable v0.1.1 // indirect
+	github.com/multiformats/go-multiaddr v0.0.1
+	github.com/multiformats/go-multiaddr-net v0.0.1
+	github.com/multiformats/go-multihash v0.0.1
+	github.com/opentracing/opentracing-go v1.0.2 // indirect
+	github.com/pkg/errors v0.8.1
+	github.com/stretchr/testify v1.3.0 // indirect
+	github.com/syndtr/goleveldb v1.0.0 // indirect
+	github.com/whyrusleeping/base32 v0.0.0-20170828182744-c30ac30633cc
+	github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1
+	github.com/whyrusleeping/go-logging v0.0.0-20170515211332-0457bb6b88fc // indirect
+	github.com/whyrusleeping/mafmt v1.2.8
+)

go.sum

+github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7 h1:PqzgE6kAMi81xWQA2QIVxjWkFHptGgC547vchpUbtFo=
+github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
+github.com/Kubuxu/go-os-helper v0.0.0-20161003143644-3d3fc2fb493d h1:S7TIGG5VLqaIbPE2Ke6/dOEdwOuxTYv55YaQ34amI4Q=
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+github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32 h1:qkOC5Gd33k54tobS36cXdAzJbeHaduLtnLQQwNoIi78=
+github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8=
+github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
+github.com/btcsuite/btcutil v0.0.0-20190207003914-4c204d697803/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
+github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd/go.mod h1:HHNXQzUsZCxOoE+CPiyCTO6x34Zs86zZUiwtpXoGdtg=
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+github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
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