TODO

2019.11.01
v Remove `unwrap`s, return a `Result`
v Set up errors
v Add a test
v Make a test PDF
v Take the PDF path as an argument
v Documentation
- Figure out what's wrong with parsing certain PDFs



523170630fd8e9ba695f4167d132a8812d814a1e
$ ./target/debug/pdf-urls ./Resources/PDF32000_2008.pdf
error: utf8 error: invalid utf-8 sequence of 1 bytes from index 0

Changed URL conversion to `String::from_utf8_lossy(s)`
$ time ./target/debug/pdf-urls ./Resources/PDF32000_2008.pdf
error: pdf error: An object does not have the expected type

real	2m19.471s
user	8m44.137s
sys	0m3.798s


2019.11.02:
v README
v Man page
v Version CLI option