bug: collector-exported v0.7.0 doesnt contains proto

[vmarchaud]

As seen there (in the Explore file):

Found it while trying the new version of one of our service that were succesfully using the 0.6.0 version, it crash with the following error:

| {"severity":"CRITICAL","error":{"type":"Error","message":"ENOENT: no such file or directory, open 'opentelemetry/proto/collector/trace/v1/trace_service.proto'","stack":"Error: ENOENT: no such file or directory, open 'opentelemetry/proto/collector/trace/v1/trace_service.proto'","errno":-2,"code":"ENOENT","syscall":"open","path":"opentelemetry/proto/collector/trace/v1/trace_service.proto"},"promise":{},"message":"unhandledRejection"}