Add Scala as support language (#636)

https://github.com/spotify/flytekit-java/tree/master/flytekit-scala is the native Scala support layer.

README.md

@@ -10,7 +10,7 @@
 ![Twitter Follow](https://img.shields.io/twitter/follow/flyteorg?label=Follow&style=social)
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-Flyte is a container-native, type-safe workflow and pipelines platform optimized for large scale processing and machine learning written in Golang. Workflows can be written in any language, with out of the box support for Python and Java.
+Flyte is a container-native, type-safe workflow and pipelines platform optimized for large scale processing and machine learning written in Golang. Workflows can be written in any language, with out of the box support for Python, Java and Scala.
 
 # Homepage
 - [flyte.org](https://flyte.org)