Update vendor

vendor/github.com/opencontainers/specs/.travis.yml

@@ -0,0 +1,18 @@
+language: go
+go:
+  - 1.6
+  - 1.5.3
+
+sudo: false
+
+before_install:
+  - go version | (grep -q 'go1.[56]' || exit 0 && go get -u github.com/golang/lint/golint )
+  - go get -u github.com/vbatts/git-validation
+
+install: true
+
+script:
+  - go vet -x ./...
+  - make .golint
+  - git-validation -run DCO,short-subject,dangling-whitespace -v
+