scala 3.0.0-RC1 milestone

Author: Dean Wampler

README.md

@@ -21,6 +21,7 @@
 | November 11, 2020 | First Scala `3.0.0-M1` milestone changes |
 | November 25, 2020 | First Scala `3.0.0-M2` milestone changes |
 | December 19, 2020 | First Scala `3.0.0-M3` milestone changes |
+| February 21, 2021 | Scala `3.0.0-RC1`  updates |
 
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