update vet

.travis.yml

@@ -30,7 +30,6 @@ install:
   - go get github.com/belogik/goes
   - go get github.com/siddontang/ledisdb/config
   - go get github.com/siddontang/ledisdb/ledis
-  - go get golang.org/x/tools/cmd/vet
   - go get github.com/ssdb/gossdb/ssdb
 before_script:
   - sh -c "if [ '$ORM_DRIVER' = 'postgres' ]; then psql -c 'create database orm_test;' -U postgres; fi"
@@ -43,5 +42,5 @@ after_script:
   -killall -w ssdb-server
   - rm -rf ./res/var/*
 script:
-  - go vet -x ./...
+  - go tool vet .
   - go test -v ./...