textproc/py-mistune: Update to 2.0.4

- Convert to USE_PYTHON=unittest

Changes:	https://github.com/lepture/mistune/releases
		https://github.com/lepture/mistune/blob/master/docs/changes.rst

textproc/py-mistune/Makefile

 # Created by: Kubilay Kocak <koobs@FreeBSD.org>
 
 PORTNAME=	mistune
-PORTVERSION=	2.0.3
+PORTVERSION=	2.0.4
 CATEGORIES=	textproc python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -13,7 +13,7 @@ LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		cpe python:3.6+
-USE_PYTHON=	autoplist concurrent distutils nose
+USE_PYTHON=	autoplist concurrent distutils unittest
 
 NO_ARCH=	yes
 

textproc/py-mistune/distinfo

-TIMESTAMP = 1656522312
-SHA256 (mistune-2.0.3.tar.gz) = d7605b46b6156b53b7d52a465202b29a6f00f4ea4130ad5d25e9d5547d6b7e50
-SIZE (mistune-2.0.3.tar.gz) = 75763
+TIMESTAMP = 1658151395
+SHA256 (mistune-2.0.4.tar.gz) = 9ee0a66053e2267aba772c71e06891fa8f1af6d4b01d5e84e267b4570d4d9808
+SIZE (mistune-2.0.4.tar.gz) = 75977