Move Optim.jl import to file that uses it

julia/ConstantOptimization.jl

@@ -1,3 +1,5 @@
+import Optim
+
 # Proxy function for optimization
 function optFunc(x::Array{Float32, 1}, tree::Node)::Float32
     setConstants(tree, x)
@@ -44,4 +46,4 @@ function optimizeConstants(member::PopMember)::PopMember
         end
     end
     return member
-end
+end

julia/sr.jl

@@ -1,4 +1,3 @@
-import Optim
 import Printf: @printf
 import Random: shuffle!, randperm