Fix pytest-html compatibility

Author: mdmintz

requirements.txt

@@ -16,8 +16,8 @@ pytest>=4.6.6;python_version<"3"
 pytest>=5.3.1;python_version>="3"
 pytest-cov>=2.8.1
 pytest-forked>=1.1.3
-pytest-html==1.22.1;python_version<"3"
-pytest-html==2.0.1;python_version>="3"
+pytest-html==1.22.1;python_version<"3.6"
+pytest-html==2.0.1;python_version>="3.6"
 pytest-metadata>=1.8.0
 pytest-ordering>=0.6
 pytest-rerunfailures>=8.0

setup.py

@@ -99,8 +99,8 @@
         'pytest>=5.3.1;python_version>="3"',
         'pytest-cov>=2.8.1',
         'pytest-forked>=1.1.3',
-        'pytest-html==1.22.1;python_version<"3"',
-        'pytest-html==2.0.1;python_version>="3"',
+        'pytest-html==1.22.1;python_version<"3.6"',
+        'pytest-html==2.0.1;python_version>="3.6"',
         'pytest-metadata>=1.8.0',
         'pytest-ordering>=0.6',
         'pytest-rerunfailures>=8.0',