Add xkcd image to Collatz Dash description
Add xkcd image to Collatz Dash description

wooey/Wooey,wooey/Wooey,hottwaj/Wooey,alexkolar/Wooey,alexkolar/Wooey,waytai/Wooey,waytai/Wooey,alexkolar/Wooey,waytai/Wooey,hottwaj/Wooey,wooey/Wooey,wooey/Wooey,hottwaj/Wooey