dev-haskell/language-ecmascript: bump up to 0.15.4

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/tasty: bump up to 0.4.2

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/smallcheck: bump up to 1.1.0.1

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>