Update Python dependencies

Author: mdmintz

requirements.txt

@@ -31,7 +31,8 @@ more-itertools==5.0.0;python_version<"3.5"
 more-itertools==8.8.0;python_version>="3.5"
 cssselect==1.1.0
 filelock==3.0.12
-fasteners==0.16.1
+fasteners==0.16;python_version<"3.6"
+fasteners==0.16.1;python_version>="3.6"
 pluggy==0.13.1
 py==1.8.1;python_version<"3.5"
 py==1.10.0;python_version>="3.5"

setup.py

@@ -146,7 +146,8 @@
         'more-itertools==8.8.0;python_version>="3.5"',
         "cssselect==1.1.0",
         "filelock==3.0.12",
-        "fasteners==0.16.1",
+        'fasteners==0.16;python_version<"3.6"',
+        'fasteners==0.16.1;python_version>="3.6"',
         "pluggy==0.13.1",
         'py==1.8.1;python_version<"3.5"',
         'py==1.10.0;python_version>="3.5"',