Update README.md (allenai#4385)

Co-authored-by: Dirk Groeneveld <dirkg@allenai.org>
matt-gardner · Jun 22, 2020 · 85e531c · 85e531c
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@@ -48,6 +48,10 @@ created a couple of template repositories that you can use as a starting place:
   distributed training), but except for those its functionality is equivalent to the config files
   setup.
 
+In addition, there are external tutorials:
+
+* [Hyperparameter optimization for AllenNLP using Optuna](https://medium.com/optuna/hyperparameter-optimization-for-allennlp-using-optuna-54b4bfecd78b)
+
 ## Package Overview
 
 <table>