textproc/py-m2r: Change RUN_DEPENDS from py-mistune to py-mistune0

- Bump PORTREVISION for dependency change

This port is not ready for mistune 2.0.0+ which has different API.

textproc/py-m2r/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	m2r
 DISTVERSION=	0.2.1
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	textproc devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -12,7 +12,7 @@ LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}docutils>0:textproc/py-docutils@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}mistune>0:textproc/py-mistune@${PY_FLAVOR}
+		${PYTHON_PKGNAMEPREFIX}mistune0>=0:textproc/py-mistune0@${PY_FLAVOR}
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}coverage>0:devel/py-coverage@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}sphinx>=0,1:textproc/py-sphinx@${PY_FLAVOR}