Fix links in README file
Fix links in README file

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dinossimpson/pyspeckit,jpinedaf/pyspeckit,bsipocz/pyspeckit,allisony/pyspeckit,pyspeckit/pyspeckit,dinossimpson/pyspeckit,low-sky/pyspeckit,mikelum/pyspeckit,keflavich/pyspeckit,vlas-sokolov/pyspeckit,pyspeckit/pyspeckit,mikelum/pyspeckit,allisony/pyspeckit,vlas-sokolov/pyspeckit,e-koch/pyspeckit,keflavich/pyspeckit,bsipocz/pyspeckit,jpinedaf/pyspeckit,low-sky/pyspeckit,e-koch/pyspeckit