Drop the graph command

Author: ysbaddaden

src/cli.cr

@@ -41,8 +41,6 @@ module Shards
           build(path, args[1..-1])
         when "check"
           Commands::Check.run(path)
-        when "graph"
-          Commands::Graph.run(path)
         when "init"
           Commands::Init.run(path)
         when "install"