Update Project.toml

Author: tlienart

Project.toml

@@ -19,7 +19,7 @@ LinearMaps = "2.6, 3.2"
 MLJModelInterface = "0.3, 0.4, 1.0"
 Optim = "0.20, 0.21, 1"
 Parameters = "0.12"
-julia = "^1"
+julia = "1.5"
 
 [extras]
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"