dev-python/wsproto: Revert "simple bump"

This is entirely broken as it misses a new dependency that is not yet
packaged.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/wsproto/Manifest

@@ -1,2 +1 @@
 DIST wsproto-0.12.0.tar.gz 45252 BLAKE2B 1be690faba6665b11e2e1c1725935addb132d7008f0ae81e7d5c383a152a5d79389287b3c152cb380e0bdfc97a3438e2a48b62f3c8acf6b501427bc617225ec0 SHA512 159b7f67eff60c2514cfca17036d95017109fe251def6cec132998ac82a037484e3e248d4335539fd03491f56c491a7cf51582aa3f74a44d7d150220a875b18d
-DIST wsproto-0.15.0.tar.gz 51765 BLAKE2B 6eae2d2ceeb2d1e870c1ca70db22708fc2e5d10aac6b1d1a44ab00f4b31e18f21fd324c7e8c95e28769f4642601b775dc687eb28b419c5698ed68e617d054599 SHA512 c9666ec65374181da762f460f0c394a5bb599f8a0666989fb2d53e5e8822f5ebdd28eae3098e115d5bbacf6d6e1dd33a9cfeb808d569e1a01025eefaff18c531

dev-python/wsproto/wsproto-0.15.0.ebuild

@@ -1,33 +0,0 @@
-# Copyright 1999-2020 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=7
-
-PYTHON_COMPAT=( python3_{6,7} )
-
-inherit distutils-r1
-
-DESCRIPTION="WebSockets state-machine based protocol implementation"
-HOMEPAGE="https://github.com/python-hyper/wsproto https://pypi.python.org/pypi/wsproto"
-SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
-
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="~amd64 ~x86"
-IUSE="test"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	=dev-python/h11-0.8*[${PYTHON_USEDEP}]
-"
-DEPEND="
-	${RDEPEND}
-	dev-python/setuptools[${PYTHON_USEDEP}]
-	test? (
-		dev-python/pytest[${PYTHON_USEDEP}]
-	)
-"
-
-python_test() {
-	py.test -v || die "Testing failed"
-}