Fix alias command do not work with command_prefix. To fix Pry::Command#run is call command_set.process_line with command_prefix arg, in case Pry.config.command_prefix is set.
Merge branch 'master' into FixCommandPrefix
Update to merge master.
Merge pull request #1056 from yui-knk/FixCommandPrefix

Fix alias command do not work with command_prefix.