Remove vendor check until supported by go mod verify

Tracking issue: golang/go#27348

.travis.yml

@@ -26,13 +26,11 @@ before_install:
 install:
   - if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash dist/gitcookie.sh; fi
   - go get golang.org/x/lint/golint
-  - go get github.com/FiloSottile/vendorcheck
   - GO111MODULE=off go get github.com/alecthomas/gometalinter
 
 script:
   - gometalinter --install
   - gometalinter --disable-all -E vet -E gofmt -E misspell -E ineffassign -E goimports -E deadcode --tests --vendor ./...
-  - vendorcheck ./...
   - go test -race ./...
 
 after_script:

appveyor.yml

@@ -19,15 +19,13 @@ install:
   - go version
   - go env
   - go get golang.org/x/lint/golint
-  - go get github.com/FiloSottile/vendorcheck
   - GO111MODULE=off go get github.com/alecthomas/gometalinter
 
 build: off
 
 test_script:
   - gometalinter --install
   - gometalinter --disable-all -E vet -E gofmt -E misspell -E ineffassign -E goimports -E deadcode --tests --vendor ./...
-  - vendorcheck ./...
   - go test -race ./...
 
 after_test: