gituser/docker: links for pyrsistent

gituser/production pyrsistent-0.18.0-cp37-cp37m-manylinux1_x86_64.whl
gituser/production pyrsistent-0.16.0-cp37-cp37m-linux_x86_64.whl
gituser/docker pyrsistent-0.16.0-cp27-cp27mu-linux_x86_64.whl