Fix POD test failing with perl 5.18

It appears that POD now doesn't like =item that could be interpreted as a number. Was getting this:
```
Failed test 'POD test for blib/lib/Business/Stripe.pm'
#   at /home/slobo/perl5/perlbrew/perls/perl-5.18.1/lib/site_perl/5.18.1/Test/Pod.pm line 186.
# blib/lib/Business/Stripe.pm (599): Expected text after =item, not a number
# blib/lib/Business/Stripe.pm (603): Expected text after =item, not a number
```

Apologize for my editor striping whitespace and making the diff messy.