www/py-flask-smorest: Update to 0.30.0

Changes: https://github.com/marshmallow-code/flask-smorest/blob/master/CHANGELOG.rst#0300-2021-04-13

PR:		255284
Submitted by:	Goran Mekić <meka AT tilda DOT center> (maintainer)

www/py-flask-smorest/Makefile

 PORTNAME=	flask-smorest
-PORTVERSION=	0.29.0
+PORTVERSION=	0.30.0
 CATEGORIES=	www devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

www/py-flask-smorest/distinfo

-TIMESTAMP = 1613218089
-SHA256 (flask-smorest-0.29.0.tar.gz) = 95c929b3e911bce89cbd25fcbd7c71ea4a693bfbe435e1dfaa6374dc2e1cf444
-SIZE (flask-smorest-0.29.0.tar.gz) = 64299
+TIMESTAMP = 1618948825
+SHA256 (flask-smorest-0.30.0.tar.gz) = 8f90187ce32f8602ad6e9f79d9b5d6c6b5e30526af6a5ff946266f2355867323
+SIZE (flask-smorest-0.30.0.tar.gz) = 64463