Update Project.toml

Author: fonsp

Project.toml

@@ -28,7 +28,7 @@ Observables = "0.5"
 Requires = "0.4.4, 0.5, 1.0.0"
 WebSockets = "1.5.0"
 Widgets = "0.6.2"
-julia = "0.7, 1"
+julia = "1.6"
 
 [extras]
 Blink = "ad839575-38b3-5650-b840-f874b8c74a25"