diff -r ed486562ba7e -r e385c9732f1e setup.py
--- a/setup.py	Fri Oct 26 17:00:05 2018 +0200
+++ b/setup.py	Fri Oct 26 17:12:26 2018 +0200
@@ -74,6 +74,7 @@
         'pytz',
         'Markdown',
         'unittest2 >= 0.7.0',
+        'filelock',
     ],
     entry_points={
         'console_scripts': [