chore: add circle

.travis.yml

@@ -1,22 +0,0 @@
-language: go
-
-go: 1.x
-
-env:
-  - "PATH=/home/travis/gopath/bin:$PATH"
-
-install:
-  - go get ./...
-  # Install gometalinter and certain linters
-  - go get github.com/alecthomas/gometalinter
-  - go get github.com/client9/misspell/cmd/misspell
-  - go get github.com/gordonklaus/ineffassign
-  - go get golang.org/x/tools/cmd/goimports
-  - go get github.com/tsenart/deadcode
-
-script:
-  - gometalinter --disable-all -E gofmt -E misspell -E ineffassign -E goimports -E deadcode --exclude="rice-box.go" --tests ./...
-  - go test ./... -timeout 30s
-
-after_success:
-  - test -n "$TRAVIS_TAG" && curl -sL https://git.io/goreleaser | bash