dev-python/seaborn: ebuild improvements ahead of Gentoo Main

as per https://github.com/gentoo/gentoo/pull/17222

dev-python/seaborn/seaborn-0.10.1.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python3_{6,7,8} )
 
 inherit distutils-r1
 
@@ -11,8 +11,8 @@ DESCRIPTION="Statistical data visualization"
 HOMEPAGE="https://seaborn.pydata.org https://github.com/mwaskom/seaborn"
 SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
 
-SLOT="0"
 LICENSE="BSD"
+SLOT="0"
 KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
 IUSE="test"
 RESTRICT="!test? ( test )"