Remove unused "portalocker" from Python dependencies

Author: mdmintz

requirements.txt

@@ -29,7 +29,6 @@ soupsieve==1.9.5;python_version<"3.5"
 soupsieve==2.0;python_version>="3.5"
 beautifulsoup4==4.9.0
 atomicwrites==1.3.0
-portalocker==1.7.0
 cryptography==2.9
 pyopenssl==19.1.0
 pygments==2.5.2;python_version<"3.5"

setup.py

@@ -111,7 +111,6 @@
         'soupsieve==2.0;python_version>="3.5"',
         'beautifulsoup4==4.9.0',
         'atomicwrites==1.3.0',
-        'portalocker==1.7.0',
         'cryptography==2.9',
         'pyopenssl==19.1.0',
         'pygments==2.5.2;python_version<"3.5"',