update dependencies

vendor/github.com/gorilla/mux/.travis.yml

@@ -1,7 +1,24 @@
 language: go
 
-go:
-  - 1.0
-  - 1.1
-  - 1.2
-  - tip
+
+matrix:
+  include:
+    - go: 1.7.x
+    - go: 1.8.x
+    - go: 1.9.x
+    - go: 1.10.x
+    - go: 1.11.x
+    - go: 1.x
+      env: LATEST=true
+    - go: tip
+  allow_failures:
+    - go: tip
+
+install:
+  - # Skip
+
+script:
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d .)
+  - if [[ "$LATEST" = true ]]; then go vet .; fi
+  - go test -v -race ./...