Update README.md

Author: ChrisRackauckas

README.md

@@ -96,9 +96,10 @@ is given below:
 We can also explore other methods in a similar way:
 
 ```julia
- f = OptimizationFunction(rosenbrock, GalacticOptim.AutoForwardDiff())
- prob = OptimizationProblem(f, x0, p)
- sol = solve(prob,BFGS())
+using ForwardDiff
+f = OptimizationFunction(rosenbrock, GalacticOptim.AutoForwardDiff())
+prob = OptimizationProblem(f, x0, p)
+sol = solve(prob,BFGS())
 ```
 For instance, the above optimization task produces the following output:
 
@@ -126,8 +127,8 @@ For instance, the above optimization task produces the following output:
 ```
 
 ```julia
- prob = OptimizationProblem(f, x0, p, lb = [-1.0,-1.0], ub = [1.0,1.0])
- sol = solve(prob, Fminbox(GradientDescent()))
+prob = OptimizationProblem(f, x0, p, lb = [-1.0,-1.0], ub = [1.0,1.0])
+sol = solve(prob, Fminbox(GradientDescent()))
 ```
 The examples clearly demonstrate that GalacticOptim.jl provides an intuitive
 way of specifying optimization tasks and offers a relatively