Go modules!

vendor/github.com/spf13/viper/.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.bench

vendor/github.com/spf13/viper/.travis.yml

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+go_import_path: github.com/spf13/viper
+
+language: go
+go:
+  - 1.9.x
+  - 1.10.x
+  - tip
+
+os:
+  - linux
+  - osx
+
+matrix:
+  allow_failures:
+    - go: tip
+  fast_finish: true
+
+script:
+  - go install ./...
+  - diff -u <(echo -n) <(gofmt -d .)
+  - go test -v ./...
+
+after_success:
+  - go get -u -d github.com/spf13/hugo
+  - cd $GOPATH/src/github.com/spf13/hugo && make && ./hugo -s docs && cd -
+
+sudo: false