python36.pkgs.contextvars: 2.3 -> 2.4

pkgs/development/python-modules/contextvars/default.nix

@@ -2,16 +2,14 @@
 
 buildPythonPackage rec {
   pname = "contextvars";
-  version = "2.3";
+  version = "2.4";
   disabled = !isPy36;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "09fnni8cyxm070bfv9ay030qbyk0dfds5nq77s0p38h33hp08h93";
+    sha256 = "f38c908aaa59c14335eeea12abea5f443646216c4e29380d7bf34d2018e2c39e";
   };
 
-  # pull request for this patch is https://github.com/MagicStack/contextvars/pull/9
-  patches = [ ./immutables_version.patch ];
   propagatedBuildInputs = [ immutables ];
 
   meta = {

pkgs/development/python-modules/contextvars/immutables_version.patch

@@ -1,11 +0,0 @@
---- ./setup.py	2018-07-30 15:40:14.000000000 +0000
-+++ ./setup.py	2019-02-12 18:33:24.984430303 +0000
-@@ -17,7 +17,7 @@
-     packages=['contextvars'],
-     provides=['contextvars'],
-     install_requires=[
--        'immutables==0.6',
-+        'immutables>=0.6',
-     ],
-     license='Apache License, Version 2.0',
-     classifiers=[