Update license attribute
Update license attribute

specifying the type and URL is deprecated:

https://docs.npmjs.com/files/package.json#license
http://npm1k.org/
iddar/hiredis-node,BridgeAR/hiredis-node,erulabs/hiredis-node,kkoopa/hiredis-node,cmpis/hiredis-node,kkoopa/hiredis-node,iddar/hiredis-node,iddar/hiredis-node,BridgeAR/hiredis-node,redis/hiredis-node,redis/hiredis-node,cmpis/hiredis-node,erulabs/hiredis-node,erulabs/hiredis-node,redis/hiredis-node,BridgeAR/hiredis-node,cmpis/hiredis-node,kkoopa/hiredis-node