Bring back files from vendor directory that we accidentally excluded

vendor/github.com/sasha-s/go-deadlock/.travis.yml

@@ -0,0 +1,26 @@
+arch:
+  - amd64
+  - ppc64le
+language: go
+sudo: false
+go:
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
+  - 1.12.x
+  - 1.13.x
+  - 1.14.x
+  - 1.15.x
+  - 1.16.x
+  - master
+  - tip
+
+before_install:
+  - go get golang.org/x/tools/cmd/cover
+  - go get -t -v ./...
+
+script:
+  - ./test.sh
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)