Merge pull request #411 from SciML/compathelper/new_version/2021-06-13-00-44-01-117-1801291156

CompatHelper: bump compat for "SymbolicUtils" to "0.12" for package perturbation

Author: ChrisRackauckas

tutorials/perturbation/Project.toml

@@ -9,5 +9,5 @@ Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 DifferentialEquations = "6.17"
 ModelingToolkit = "5.17"
 SciMLTutorials = "0.9"
-SymbolicUtils = "0.11"
-Symbolics = "0.1"
+SymbolicUtils = "0.11, 0.12"
+Symbolics = "0.1"