Update simpleweighteddigraph.jl (#68)

Fixes sbromberger/LightGraphs.jl#1523 and #67.

Author: sbromberger

src/simpleweighteddigraph.jl

@@ -78,7 +78,7 @@ function SimpleWeightedDiGraph(i::AbstractVector{T}, j::AbstractVector{T}, v::Ab
     SimpleWeightedDiGraph{T, U}(sparse(j, i, v, m, m, combine), permute=false)
 end
 
-LightGraphs.SimpleDiGraph(g::SimpleWeightedDiGraph) = SimpleDiGraph(g.weights)
+LightGraphs.SimpleDiGraph(g::SimpleWeightedDiGraph) = SimpleDiGraph(g.weights')
 
 edgetype(::SimpleWeightedDiGraph{T, U}) where T<:Integer where U<:Real = SimpleWeightedGraphEdge{T,U}