downgraded MarkupSafe

docs/index.rst

@@ -83,10 +83,11 @@ Otherwise :code:`PyInit` won't be generated by Cython
 and such module will be unimportable in Python. Normal import won't suffice.
 
 Please install Snakehouse in a separate venv. This is because it requires an ancient version of
-the templating library Mako_, because newer versions requires Python 3.8, and I wanted
+the templating library Mako_ and MarkupSafe_, because newer versions requires Python 3.8, and I wanted
 Snakehouse to support older Pythons as well.
 
 .. _Mako: https://pypi.org/project/Mako/1.1.0/
+.. _MarkupSafe: https://pypi.org/project/MarkupSafe/1.1.1/
 
 Contributions
 =============

requirements.txt

 Cython
 mako==1.1.0
 satella
+MarkupSafe==1.1.1
\ No newline at end of file

setup.cfg

@@ -35,6 +35,7 @@ install_requires =
     Cython
     mako == 1.1.0
     satella
+    MarkupSafe == 1.1.1
 
 python_requires = !=2.7.*,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
 packages = find: