*: fix instructions in README for downloading and running dex
*: fix instructions in README for downloading and running dex

coreos/dex,chub/coreos-dex,circleci/dex,jwmaag/dex,holgerkoser/dex,cjyar/dex,xeonx/dex,rithujohn191/dex,rithujohn191/dex,holgerkoser/dex,xeonx/dex,cjyar/dex,circleci/dex,chub/coreos-dex,jwmaag/dex,Calpicow/dex,coreos/dex,wolfeidau/dex,cjyar/dex,Calpicow/dex,coreos/dex,holgerkoser/dex,circleci/dex,ericchiang/dex,wolfeidau/dex,wolfeidau/dex,xeonx/dex,Calpicow/dex,chub/coreos-dex,ericchiang/dex,ericchiang/dex,rithujohn191/dex,jwmaag/dex