Typo in update_state! for DE.jl

[jonathanfischer97]

In the file DE.jl, there is a reference to F_max on line 96 which is not defined in the scope of update_state! and throws an error when DE is constructed with an F_max value. Here is the typo:

Typo

if parameters.F_min < parameters.F_max
    F = parameters.F_min + (F_max - parameters.F_min) * rand(rng)
end

Solution

if parameters.F_min < parameters.F_max
    F = parameters.F_min + (parameters.F_max - parameters.F_min) * rand(rng)
end

[mcamilletti1]

Submitted a PR to fix this!

[jmejia8]

Thank you!

#100

Merged.