[docs] add SpringOne 2020 presentation (#918)

Author: dariuszkuc

docs/blogs-and-videos.md

@@ -8,6 +8,7 @@ Here are some links to other blog posts and videos which may provide further exa
 ## graphql-kotlin
 Articles and videos specifically about `graphql-kotlin`
 
+* 📺  [Bootiful GraphQL with Kotlin (Dariusz Kuc, Guillaume Scheibel)(Spring One 2020)](https://www.youtube.com/watch?v=t9He4vHZC24) (en)
 * 📺  [Bootiful GraphQL with Kotlin (Dariusz Kuc)(GOTO Chicago 2020)](https://www.youtube.com/watch?v=1siPT1pTXFU) (en)
 * 📝  [Introducing GraphQL Kotlin Client](https://medium.com/expedia-group-tech/introducing-graphql-kotlin-client-b32dc3061a6f)
 * 📝  [Announcing graphql-kotlin 2.0!](https://medium.com/expedia-group-tech/graphql-kotlin-2-0-4006ea41f774)