pythonPackages.structlog: patch to fix tests, build

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

@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, fetchpatch
 , pytest
 , pretend
 , freezegun
@@ -16,6 +17,14 @@ buildPythonPackage rec {
     sha256 = "6980001045abd235fa12582222627c19b89109e58b85eb77d5a5abc778df6e20";
   };
 
+  patches = [
+    # Fix tests for pytest 3.3
+    (fetchpatch {
+      url = "https://github.com/hynek/structlog/commit/22f0ae50607a0cb024361599f84610ce290deb99.patch";
+      sha256 = "03622i13ammkpyrdk48kimbz94gbkpcmdpy0kj2z09m1kp6q2ljv";
+    })
+  ];
+
   checkInputs = [ pytest pretend freezegun ];
   propagatedBuildInputs = [ simplejson ];
 
@@ -29,4 +38,4 @@ buildPythonPackage rec {
     homepage = http://www.structlog.org/;
     license = lib.licenses.asl20;
   };
-}
+}