Index: requirements.txt
===================================================================
diff -u -r0aafb89be06b70937b9a32612397ce921844373a -re0aa5ffe3d2aa8153e01e07b41f80d12e07fed2d
--- requirements.txt	(.../requirements.txt)	(revision 0aafb89be06b70937b9a32612397ce921844373a)
+++ requirements.txt	(.../requirements.txt)	(revision e0aa5ffe3d2aa8153e01e07b41f80d12e07fed2d)
@@ -5,14 +5,14 @@
 chardet==3.0.4
 commonmark==0.9.1
 cycler==0.10.0
-dataclasses
+dataclasses; python_version < "3.7"
 docutils==0.16
 doxypypy==0.8.8.6
 et-xmlfile==1.0.1
 flake8==3.8.4
 idna==2.9
 imagesize==1.2.0
-importlib-metadata==2.0.0
+importlib-metadata==2.0.0; python_version < "3.8"
 Jinja2==2.11.2
 kiwisolver==1.1.0
 m2r==0.2.1