Log Message:
p5-WWW-Mechanize-Shell: update to 0.57.

0.57 20180604
  + Add "images" command to list all images
  + Allow other user agent objects like WWW::Mechanize::Chrome
    Use it from the command line as
        perl -Ilib -MWWW::Mechanize::Chrome \
                   -MWWW::Mechanize::Shell \
                   -e"shell(agent => WWW::Mechanize::Chrome->new())"