chore: get rid of travis

.travis.yml

@@ -1,19 +0,0 @@
-language: go
-go: 1.11.x
-go_import_path: moul.io/protoc-gen-gotemplate
-install:
-- go get github.com/Masterminds/glide
-- wget https://raw.githubusercontent.com/grpc-ecosystem/grpc-gateway/v1.5.0/.travis/install-protoc.sh && chmod +x install-protoc.sh && ./install-protoc.sh 3.4.0
-- go get -u github.com/golang/protobuf/protoc-gen-go
-- go get github.com/securego/gosec/cmd/gosec/...
-- curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.12.2
-script:
-- make install
-- make test
-- PATH=$PATH:$(pwd)/bin make lint
-cache:
-  directories:
-  - $HOME/local
-env:
-  global:
-  - "PATH=$PATH:$HOME/local/bin"