Upgrading vendor folder dependencies.

vendor/github.com/davecgh/go-spew/.travis.yml

@@ -1,14 +1,28 @@
 language: go
+go_import_path: github.com/davecgh/go-spew
 go:
-    - 1.5.4
-    - 1.6.3
-    - 1.7
+    - 1.6.x
+    - 1.7.x
+    - 1.8.x
+    - 1.9.x
+    - 1.10.x
+    - tip
+sudo: false
 install:
-    - go get -v golang.org/x/tools/cmd/cover
+    - go get -v github.com/alecthomas/gometalinter
+    - gometalinter --install
 script:
-    - go test -v -tags=safe ./spew
-    - go test -v -tags=testcgo ./spew -covermode=count -coverprofile=profile.cov
+    - export PATH=$PATH:$HOME/gopath/bin
+    - export GORACE="halt_on_error=1"
+    - test -z "$(gometalinter --disable-all
+      --enable=gofmt
+      --enable=golint
+      --enable=vet
+      --enable=gosimple
+      --enable=unconvert
+      --deadline=4m ./spew | tee /dev/stderr)"
+    - go test -v -race -tags safe ./spew
+    - go test -v -race -tags testcgo ./spew -covermode=atomic -coverprofile=profile.cov
 after_success:
     - go get -v github.com/mattn/goveralls
-    - export PATH=$PATH:$HOME/gopath/bin
     - goveralls -coverprofile=profile.cov -service=travis-ci