remove go get varcheck

Author: Liujingfang1

.travis.yml

@@ -8,7 +8,6 @@ go:
 before_install:
   - source ./bin/consider-early-travis-exit.sh
   - sudo apt-get install tree
-  - go get -u github.com/opennota/check/cmd/varcheck
   - go get -u github.com/golang/lint/golint
   - go get -u golang.org/x/tools/cmd/goimports
   - go get -u github.com/onsi/ginkgo/ginkgo