generate please.build BUILD.please files from existing bazel BUILD.bazel/WORKSPACE files
[x] Parse WORKSPACE, extract go_repository entries and convert to go_get rules
$ gaz --from_file=go.mod | jq -r '"go_get(name = \"\(.Name)\", get = \"\(.ImportPath)\", revision = \"\(.Version)\")"' >> third_party/go/BUILD.please
[ ] Parse BUILD.bazel, extract go_library, go_binary entries and rewrite the deps field based on the content of third_party/go/BUILD.please