use go modules

.travis.yml

@@ -6,5 +6,5 @@ before_install:
   - go get github.com/mattn/goveralls
   - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.15.0
 script:
-  - make test
-  - $HOME/gopath/bin/goveralls -ignore "internal/queryset/generator/test/autogenerated_models.go,examples/comparison/*/*.go,internal/queryset/generator/test/pkgimport/*.go,internal/queryset/generator/test/pkgimport/*/*/*.go" -v -service=travis-ci
+  - env GO111MODULE=on make test
+  - env GO111MODULE=on $HOME/gopath/bin/goveralls -ignore "internal/queryset/generator/test/autogenerated_models.go,examples/comparison/*/*.go,internal/queryset/generator/test/pkgimport/*.go,internal/queryset/generator/test/pkgimport/*/*/*.go" -v -service=travis-ci

go.mod

@@ -0,0 +1,19 @@
+module github.com/jirfag/go-queryset
+
+require (
+	cloud.google.com/go v0.37.0 // indirect
+	github.com/denisenkom/go-mssqldb v0.0.0-20190315220205-a8ed825ac853 // indirect
+	github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 // indirect
+	github.com/go-sql-driver/mysql v0.0.0-20170822214809-26471af196a1 // indirect
+	github.com/gofrs/uuid v3.2.0+incompatible // indirect
+	github.com/jinzhu/gorm v1.9.2
+	github.com/jinzhu/inflection v0.0.0-20170102125226-1c35d901db3d // indirect
+	github.com/jinzhu/now v1.0.0 // indirect
+	github.com/lib/pq v1.0.0 // indirect
+	github.com/mattn/go-sqlite3 v1.10.0 // indirect
+	github.com/pkg/errors v0.8.1
+	github.com/stretchr/testify v1.3.0
+	golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 // indirect
+	golang.org/x/tools v0.0.0-20190226205152-f727befe758c
+	gopkg.in/DATA-DOG/go-sqlmock.v1 v1.2.0
+)