add links to features

README.md

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 # puzzles
 Solutions to various puzzles. Each subdirectory has its own README to describe the solution, and most have corresponding blog posts at http://tylerjamesburch.com/blog/. 
 
-I've been the featured solution on one 538 Riddler - see the feature [here](https://fivethirtyeight.com/features/can-you-win-a-spelling-bee-if-you-know-99-percent-of-the-words/) (Scroll to the bottom for the Riddler classic)
+### My solutions featured on FiveThirtyEight
+
+- [Can You Turn America’s Pastime Into A Game Of Yahtzee?](https://fivethirtyeight.com/features/can-you-win-a-spelling-bee-if-you-know-99-percent-of-the-words/) (Featured in Riddler classic)
+- [Astrophysical Signals](https://fivethirtyeight.com/features/can-you-win-a-spelling-bee-if-you-know-99-percent-of-the-words/)

riddler538_2020_Aug21/README.md

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 This year I've been trying to learn more about probabilistic programming and Bayesian inference. Additionally, I've been playing around with some other programming languages, R and Julia. This week's [Riddler question at FiveThirtyEight]((https://fivethirtyeight.com/features/can-you-corral-your-hamster/)) seemed like a good opportunity to utilize these things - I did this solution in Julia, using the [Turing.jl](https://turing.ml/dev/) probabilistic programming library.
 
+This solution mentioned in the featured solutions - see [here](https://fivethirtyeight.com/features/can-you-cover-the-globe/)
+
 ## Riddler Express
 
 >When you started your doctorate several years ago, your astrophysics lab noticed some unusual signals coming in from deep space on a particular frequency — hydrogen times tau. After analyzing a trove of data measured at many regular intervals, you compute that you heard zero signals in 45 percent of the intervals, one signal in 38 percent of the intervals and two signals in the remaining 17 percent of the intervals.