python.pkgs.tweepy: fix build with pip 10

This applies https://github.com/tweepy/tweepy/pull/1030.

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

@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, requests, six, requests_oauthlib }:
+{ lib, buildPythonPackage, fetchPypi, fetchpatch, requests, six, requests_oauthlib }:
 
 buildPythonPackage rec {
   pname = "tweepy";
@@ -9,6 +9,13 @@ buildPythonPackage rec {
     sha256 = "901500666de5e265d93e611dc05066bb020481c85550d6bcbf8030212938902c";
   };
 
+  # Fix build with pip 10
+  # https://github.com/tweepy/tweepy/pull/1030
+  patches = fetchpatch {
+    url = "${meta.homepage}/commit/778bd7a31d2f5fae98652735e7844533589ca221.patch";
+    sha256 = "1sqmjn0ngiynhfkdkcs33qmvl49ysfp8522hvxjk8bx252y9qw2h";
+  };
+
   doCheck = false;
   propagatedBuildInputs = [ requests six requests_oauthlib ];