Fix double last entry

First of all, thanks to @jm81 and @barmstrong for putting time and energy into this library.  We love it.

This pull request deals with a bug we noticed with parsing that duplicated the last line entry.  I'm not entirely sure if there isn't some case that warrants the line that got removed, but this pull request adds the failing test and fix for it (and works for us when we parse and display sent ACH files now).