media-libs/rubberband: add alpha keyword

Gentoo-Bug: 570510

Package-Manager: portage-2.2.27
diff --git a/media-libs/rubberband/rubberband-1.8.1-r1.ebuild b/media-libs/rubberband/rubberband-1.8.1-r1.ebuild
index 9308923..1ad0356 100644
--- a/media-libs/rubberband/rubberband-1.8.1-r1.ebuild
+++ b/media-libs/rubberband/rubberband-1.8.1-r1.ebuild
@@ -11,7 +11,7 @@
 
 LICENSE="GPL-2"
 SLOT="0"
-KEYWORDS="~alpha amd64 ~hppa ~ppc ~ppc64 ~x86"
+KEYWORDS="alpha amd64 ~hppa ~ppc ~ppc64 ~x86"
 IUSE="static-libs"
 
 RDEPEND="media-libs/vamp-plugin-sdk[${MULTILIB_USEDEP}]