Added link to Wikipedia
Added link to Wikipedia

This reverts commit a153067e60fcd90d8a8b6448fbc5d9e0c5753076.

raywenderlich/swift-algorithm-club,jawwad/swift-algorithm-club,tkester/swift-algorithm-club,tkester/swift-algorithm-club,jawwad/swift-algorithm-club,raywenderlich/swift-algorithm-club,jawwad/swift-algorithm-club,raywenderlich/swift-algorithm-club,hollance/swift-algorithm-club