Adding free-proxy
Adding free-proxy

Co-authored-by: Quisheng Wu <2bf1cea3d4274611f7b1fb5b29220dfa2b2942aa@utk.edu>

mariusvniekerk/staged-recipes,jakirkham/staged-recipes,kwilcox/staged-recipes,jakirkham/staged-recipes,goanpeca/staged-recipes,johanneskoester/staged-recipes,kwilcox/staged-recipes,conda-forge/staged-recipes,ReimarBauer/staged-recipes,ocefpaf/staged-recipes,ReimarBauer/staged-recipes,stuertz/staged-recipes,hadim/staged-recipes,hadim/staged-recipes,conda-forge/staged-recipes,johanneskoester/staged-recipes,ocefpaf/staged-recipes,goanpeca/staged-recipes,mariusvniekerk/staged-recipes,stuertz/staged-recipes