Fixing README and making image HTTPS to avoid github cache.
Fixing README and making image HTTPS to avoid github cache.

VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016,VisionistInc/advent-of-code-2016