dev-python/ratelimit: Enable py3.{7,8}, modernize

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

dev-python/ratelimit/ratelimit-1.4.1.ebuild

@@ -1,8 +1,8 @@
 # Copyright 1999-2020 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=6
-PYTHON_COMPAT=( python3_6 )
+EAPI=7
+PYTHON_COMPAT=( python3_{6,7,8} )
 
 inherit distutils-r1
 
@@ -13,18 +13,11 @@ HOMEPAGE="https://github.com/tomasbasham/ratelimit"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
-IUSE="test"
-RESTRICT="!test? ( test )"
 
-DEPEND="
-	test? ( dev-python/pytest[${PYTHON_USEDEP}] )"
+distutils_enable_tests pytest
 
 src_prepare() {
 	default
 	# remove --cov args injection
 	rm pytest.ini || die
 }
-
-python_test() {
-	pytest || die
-}