glide.yaml: update goxmldsig
glide.yaml: update goxmldsig

rithujohn191/dex,chub/coreos-dex,Calpicow/dex,rithujohn191/dex,wolfeidau/dex,wolfeidau/dex,wolfeidau/dex,ericchiang/dex,coreos/dex,coreos/dex,chub/coreos-dex,circleci/dex,rithujohn191/dex,Calpicow/dex,chub/coreos-dex,circleci/dex,coreos/dex,ericchiang/dex,ericchiang/dex,Calpicow/dex,circleci/dex