Merge pull request #66 from SciML/compathelper/new_version/2020-04-14-00-28-32-568-3225202539

CompatHelper: bump compat for "ModelingToolkit" to "3.0"

Author: ChrisRackauckas

Project.toml

@@ -14,7 +14,7 @@ ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 DataStructures = "0.17"
 DiffEqBase = "6.5"
 Latexify = "0.11, 0.12, 0.13"
-ModelingToolkit = "1.3, 2.0"
+ModelingToolkit = "1.3, 2.0, 3.0"
 julia = "1.3"
 
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