Remove upper version constrainsts on deps

They are a source of artificial problems

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

setup.cfg

@@ -44,7 +44,7 @@ include_package_data = true
 zip_safe = false
 install_requires =
     attrs
-    boolean.py >= 3.5, < 4.0
+    boolean.py >= 3.5
     certifi
     click
     jinja2
@@ -54,7 +54,7 @@ install_requires =
     saneyaml
 
 setup_requires = setuptools_scm[toml] >= 4
-python_requires = >=3.6.*, <4
+python_requires = >=3.6
 
 [options.packages.find]
 where=src