Merge pull request #13 from rowan-walsh/fix/dateutil-deprec-warning

Fix depreciation warning from dateutil 2.8.2

Author: dallaslu

requirements.txt

@@ -1,3 +1,3 @@
 beancount>=2.3.4
 beangulp>=0.1.1
-python-dateutil~=2.8.2
+python-dateutil~=2.9.0