Rm 0.16 and add 0.19 versions of SymbolicUtils (#55)

The Compathelper's PR has conflicts which I can't view/resolve

Author: ven-k

Project.toml

@@ -13,7 +13,7 @@ SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
 Catalyst = "9, 10"
 MathML = "0.1"
 SBML = "0.9"
-SymbolicUtils = "0.16, 0.18"
+SymbolicUtils = "0.17, 0.18, 0.19"
 julia = "1.6"
 
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