migrate to go modules from vndr

Signed-off-by: Tariq Ibrahim <tariq181290@gmail.com>

vendor/google.golang.org/grpc/.travis.yml

@@ -0,0 +1,13 @@
+language: go
+
+before_install:
+  - go get github.com/axw/gocov/gocov
+  - go get github.com/mattn/goveralls
+  - go get golang.org/x/tools/cmd/cover
+
+install:
+  - mkdir -p "$GOPATH/src/google.golang.org"
+  - mv "$TRAVIS_BUILD_DIR" "$GOPATH/src/google.golang.org/grpc"
+
+script:
+  - make test testrace