python3Packages.yowsup: 2.5.2 -> 2.5.7

The latest update of `yowsup` (https://github.com/tgalal/yowsup/releases/tag/v2.5.7)
contains the following fixes:

* Updated tokens
* Fixed tgalal/yowsup#1842: Bug in protocol_groups RemoveGroupsNotificationProtocolEntity
* Other minor bug fixes

The `argparse-dependency.patch` required a rebase onto the latest
version of `setup.py` and ensures that `argparse` won't be needed as
extra dependency as our `python3` package ships `argparse` by default.

A short note to Python 2 support:

the actual issue related to Python 2.x support has been resolved
(https://github.com/tgalal/yowsup/issues/2325#issuecomment-354533727),
however this relies on `six==1.10` which isn't support by `nixpkgs` as
`six` has been bumped to `1.11`. When trying to inject a patched version
of our `six` package based on `six==1.10` you'll run into issues with
duplicated libraries in your closure as further build dependencies
(`pytest` in this case) use the latest `six` version. As Python 2.7 will
die in 2020 (https://pythonclock.org/) and patching around in the
dependencies of `pytest` to get `yowsup` running isn't worth the effort
in my opinion I decided to keep the Python 2.x build disabled for now.

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

@@ -3,19 +3,18 @@
 }:
 
 buildPythonPackage rec {
-  name = "${pname}-${version}";
   pname = "yowsup";
-  version = "2.5.2";
+  version = "2.5.7";
 
-  # python2 is currently incompatible with yowsup:
-  # https://github.com/tgalal/yowsup/issues/2325#issuecomment-343516519
+  # The Python 2.x support of this package is incompatible with `six==1.11`:
+  # https://github.com/tgalal/yowsup/issues/2416#issuecomment-365113486
   disabled = !isPy3k;
 
   src = fetchFromGitHub {
     owner = "tgalal";
     repo = "yowsup";
     rev = "v${version}";
-    sha256 = "16l8jmr32wwvl11m0a4r4id3dkfqj2n7dn6gky1077xwmj2da4fl";
+    sha256 = "1p0hdj5x38v2cxjnhdnqcnp5g7la57mbi365m0z83wa01x2n73w6";
   };
 
   checkInputs = [ pytest ];