update vendor and use single static

vendor/github.com/gin-gonic/autotls/.travis.yml

@@ -0,0 +1,26 @@
+language: go
+sudo: false
+go:
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - master
+
+git:
+  depth: 3
+
+install:
+  - go get -v github.com/kardianos/govendor
+  - govendor sync
+  - go get -u github.com/campoy/embedmd
+
+script:
+  - embedmd -d README.md
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/7f95bf605c4d356372f4
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false