Update FreeCoding.json with new solutions

[robinlmp]

This is my first ever pull request so I hope I've done it right. Really sorry if I've messed anything up Paul.

I came across this solution (having been reading Paul's book, Pro Swift) that Unwrap marks as incorrect:

var evens = [Int]()

for i in 1...100 where i % 2 == 0 { evens.append(i) }

I've added that and a variation for 1..<101

[twostraws]

Really great job – thank you for contributing!

[robinlmp]

I'm surprised by how exhilarating this is!