all: fix travis after v1 update

Change-Id: I3194f4d2e57903d7ae0d6c20bae551dc6ab7d8ce
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/166891
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

cmd/protoc-gen-go-grpc/testdata/go.mod

@@ -1,7 +1,7 @@
 module github.com/golang/protobuf/v2/cmd/protoc-gen-go-grpc/testdata
 
 require (
-	github.com/golang/protobuf v1.2.1-0.20190228215449-22c36ed95480
+	github.com/golang/protobuf v1.2.1-0.20190311234659-51c19b98ee31
 	github.com/golang/protobuf/v2 v2.0.0
 	google.golang.org/grpc v1.19.0
 )

cmd/protoc-gen-go/testdata/go.mod

@@ -1,7 +1,7 @@
 module github.com/golang/protobuf/v2/cmd/protoc-gen-go/testdata
 
 require (
-	github.com/golang/protobuf v1.2.1-0.20190228215449-22c36ed95480
+	github.com/golang/protobuf v1.2.1-0.20190311234659-51c19b98ee31
 	github.com/golang/protobuf/v2 v2.0.0
 )
 

go.mod

@@ -2,5 +2,5 @@ module github.com/golang/protobuf/v2
 
 require (
 	github.com/golang/protobuf v1.2.1-0.20190311233832-968e039ade03
-	github.com/google/go-cmp v0.2.0
+	github.com/google/go-cmp v0.2.1-0.20190228024137-c81281657ad9
 )

go.sum

@@ -1,4 +1,4 @@
 github.com/golang/protobuf v1.2.1-0.20190311233832-968e039ade03 h1:9fMonKrK3A/zUsodyCLUQVFrEDPi/veKKdEemKA8H9k=
 github.com/golang/protobuf v1.2.1-0.20190311233832-968e039ade03/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
-github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/go-cmp v0.2.1-0.20190228024137-c81281657ad9 h1:GDk30QdVXDf6i734280OeWAO9UCCjXLeWkLLyHQGUkI=
+github.com/google/go-cmp v0.2.1-0.20190228024137-c81281657ad9/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=