Upgraded to testify 1.3.0.

vendor/github.com/stretchr/testify/.travis.yml

@@ -2,14 +2,18 @@ language: go
 
 sudo: false
 
-go:
-  - 1.7
-  - 1.8
-  - 1.9
-  - tip
-
-script:
-  - ./.travis.gogenerate.sh
-  - ./.travis.gofmt.sh
-  - ./.travis.govet.sh
-  - go test -v -race ./...
+matrix:
+  include:
+    - go: "1.8.x"
+    - go: "1.9.x"
+    - go: "1.10.x"
+    - go: "1.11.x"
+      env: GO111MODULE=off
+    - go: "1.11.x"
+      env: GO111MODULE=on
+    - go: tip
+  script:
+    - ./.travis.gogenerate.sh
+    - ./.travis.gofmt.sh
+    - ./.travis.govet.sh
+    - go test -v -race $(go list ./... | grep -v vendor)