Reorder the input validation (fixes #21)

We used to assume that if a source is not a local file,
then it must be a URL. Now, we check if a source is a
URL and if not, also check if it's a local file. If neither,
then we can raise an error.

1 files changed, 1 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index f54170a..bddbd24 100644
--- a/setup.py
+++ b/setup.py
@@ -25,6 +25,7 @@ REQUIRED = [
     "unidecode>=1.1",
     "titlecase>=0.12",
     "PyPDF2>=1.26",
+    "regex>=2018.11"
 ]
 
 docs_require = []