add contributors to metadata and pod
annotate the plugins; provide a test name
changelog for this fix
update the checksum immediately when content changes

This can potentially ward off more problems in the future, say if the callback
sub happens to change the content back to its original state.
more annotations
add documentation warning about potential infinite loops
tighten up entries
add irc and mailinglist info to metadata
use subheaders rather than itemized lists for attributes and methods
Pod::Weaver 4 now handles encodings better
move this comment to the code it is referring to
capitalization in docs
clarify via tests whether the content changes before or after the callback is called

NOTE that this might change in the future! please come talk to me if you have an opinion.
test the default sub, and use it to document the callback args
Dist-Zilla-Role-File-ChangeNotification-0.002

          - the checksum is updated (and therefore the callback is invoked)
            for every change to the content, not just (potentially) the first
            (thanks, Yanick!)