add replace golang (go-kratos#33)

go.mod

@@ -35,3 +35,19 @@ require (
 	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 	gopkg.in/go-playground/validator.v9 v9.26.0
 )
+
+replace (
+	cloud.google.com/go => github.com/googleapis/google-cloud-go v0.26.0
+	golang.org/x/crypto => github.com/golang/crypto v0.0.0-20190123085648-057139ce5d2b
+	golang.org/x/lint => github.com/golang/lint v0.0.0-20181026193005-c67002cb31c3
+	golang.org/x/net => github.com/golang/net v0.0.0-20190311183353-d8887717615a
+	golang.org/x/oauth2 => github.com/golang/oauth2 v0.0.0-20180821212333-d2e6202438be
+	golang.org/x/sync => github.com/golang/sync v0.0.0-20181108010431-42b317875d0f
+	golang.org/x/sys => github.com/golang/sys v0.0.0-20180905080454-ebe1bf3edb33
+	golang.org/x/text => github.com/golang/text v0.3.0
+	golang.org/x/time => github.com/golang/time v0.0.0-20190308202827-9d24e82272b4
+	golang.org/x/tools => github.com/golang/tools v0.0.0-20190328211700-ab21143f2384
+	google.golang.org/appengine => github.com/golang/appengine v1.1.0
+	google.golang.org/genproto => github.com/google/go-genproto v0.0.0-20180817151627-c66870c02cf8
+	google.golang.org/grpc => github.com/grpc/grpc-go v1.18.0
+)