Please update https://hub.docker.com/r/msoedov/pyflame/ to a more recent pyflame version

I have been using your docker images, and they're really useful for single-threaded processes. Occasionally I have worker threads that I need to profile too, and pyflame 1.2.1 doesn't have the --threads option.

My current work-around is to use the rebuild hosted at  https://hub.docker.com/r/asaleh/pyflame/ which is of pyflame 1.6.6.
