SemOpt ctor: fixup ws

Author: Alexey Stukalov

src/optimizer/abstract.jl

@@ -35,7 +35,7 @@ function SemOptimizer(::Val{E}, args...; kwargs...) where {E}
     end
 end
 
-SemOptimizer{E}(args...; kwargs...) where E = SemOptimizer(Val(E), args...; kwargs...)
+SemOptimizer{E}(args...; kwargs...) where {E} = SemOptimizer(Val(E), args...; kwargs...)
 
 """
     optimizer_engines()