downgraded satella

docs/index.rst

@@ -82,12 +82,9 @@ or
 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_ 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/
+Please install Snakehouse in a separate venv. This is because it requires ancient version of
+several packages, because authors of these packages were quick to drop support for
+earlier Pythons.
 
 Contributions
 =============

requirements.txt

 Cython
 mako==1.1.0
-satella
+satella==2.20.0
 MarkupSafe==1.1.1
\ No newline at end of file

setup.cfg

@@ -34,7 +34,7 @@ classifier =
 install_requires =
     Cython
     mako == 1.1.0
-    satella
+    satella == 2.20.0
     MarkupSafe == 1.1.1
 
 python_requires = !=2.7.*,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*