…tent field called 'public_key'. Requires Net::Heroku 0.20.

Changed to using .netrc as the Heroku credentials file, like the official heroku-cli app does

Changed perloku upstream URL
Fixed credentials_file reference
Now using Mojo::Util::getopt
Using Mojolicious::Command::extract_usage to print usage from SYNOPSIS doc section
Fixed tempdir call to actually create a directory with the intended template
Updated docs to reflect changes

Updated Heroku signup URL
Changed to generating Procfile style run script in generate command

Bumped version to prevent confusion due to prior typos.

…space.

Fixed return value of git sub.
Fixed erroneous error message specifying --appname option, should've been --name.