Update "soupsieve" dependency for Python 3.5+

Author: mdmintz

requirements.txt

@@ -24,7 +24,8 @@ pytest-ordering>=0.6
 pytest-rerunfailures>=8.0
 pytest-xdist>=1.31.0
 parameterized>=0.7.1
-soupsieve==1.9.5
+soupsieve==1.9.5;python_version<"3.5"
+soupsieve==2.0;python_version>="3.5"
 beautifulsoup4==4.8.2
 atomicwrites==1.3.0
 portalocker==1.5.2

setup.py

@@ -106,7 +106,8 @@
         'pytest-rerunfailures>=8.0',
         'pytest-xdist>=1.31.0',
         'parameterized>=0.7.1',
-        'soupsieve==1.9.5',
+        'soupsieve==1.9.5;python_version<"3.5"',
+        'soupsieve==2.0;python_version>="3.5"',
         'beautifulsoup4==4.8.2',
         'atomicwrites==1.3.0',
         'portalocker==1.5.2',