message: Add Symbolics Lisp as possible gui inspiration
diff: @@ -21,6 +21,7 @@ While the hopes behind this are ambitious, we will need to proceed carefully, ta
  - [MPS](https://www.jetbrains.com/mps/)
  - [Pharo](https://pharo.org/)
  - [Self](https://www.jetbrains.com/mps/)
  +- [Symbolics Lisp](https://twitter.com/RainerJoswig/status/1213528401774071813)
  ### Collections
  