Update three "other" models (#378)

* explicit Autoregressive

* explicit iris

* explicit FizzBuzz

Author: mcabbott

README.md

@@ -83,11 +83,11 @@ Flux v0.13 is the latest right now, marked with ☀️; models upgraded to use
 * [Recursive net on IMDB sentiment treebank](text/treebank) ⛅️ v0.11
 
 **Other** & contributed models
-* [Logistic Regression Iris](other/iris/iris.jl) ☀️ v0.13
-* [Autoregressive Model](other/autoregressive-process/) ☀️ v0.13
+* [Logistic Regression Iris](other/iris/iris.jl) ☀️ v0.13 +
+* [Autoregressive Model](other/autoregressive-process/) ☀️ v0.13 +
 * [BitString Parity Challenge](other/bitstring-parity) ⛅️ v0.11
 * [MLP on housing data](other/housing/) (low level API) ⛅️ v0.11
-* [FizzBuzz](other/fizzbuzz/fizzbuzz.jl) ⛅️ v0.11
+* [FizzBuzz](other/fizzbuzz/fizzbuzz.jl) ☀️ v0.13 +
 * [Meta-Learning](contrib/meta-learning/MetaLearning.jl) ❄️ v0.7
 * [Speech recognition](contrib/audio/speech-blstm) ❄️ v0.6