also test interaction with [ModuleBuild], [ModuleBuildTiny], [MakeMaker::Awesome]
insert the new content in the middle of the file, after the initial preamble, instead of right at the front

For this to work on [ModuleBuildTiny], we need a new release for
Leont/dist-zilla-plugin-modulebuildtiny #8
(https://github.com/Leont/dist-zilla-plugin-modulebuildtiny/pull/8)
add header to inserted code section
add a placeholder .mailmap
tighter entry
fix pod header name
remove unnecessary plugin
shorter pod lists
new CPAN::Meta requires license to be an arrayref
add irc and mailing list info to distribution metadata
add some keywords to metadata
also report on the versions of MB and MBT
test the injected prereqs
provide config data for [MetaConfig]
better diagnostic output on failure
whitespace
munge the file at the proper phase, if the file was created early enough