Adjust h2 version requirement (#5066)

setup.py

@@ -31,7 +31,7 @@ install_requires = [
     'zope.interface>=4.1.3',
     'protego>=0.1.15',
     'itemadapter>=0.1.0',
-    'h2>=3.2.0',
+    'h2>=3.0,<4.0',
 ]
 extras_require = {}
 cpython_dependencies = [

tox.ini

@@ -71,7 +71,7 @@ commands =
 deps =
     cryptography==2.0
     cssselect==0.9.1
-    h2==3.2.0
+    h2==3.0
     itemadapter==0.1.0
     parsel==1.5.0
     Protego==0.1.15