remove import of TypeConstraints GH #2

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
add perl 5.20 to CI testing

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
ensure Test::EOL gets pulled in as an authordep

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
improve dep handling

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>