Update Downstream.yml

Author: ChrisRackauckas

.github/workflows/Downstream.yml

@@ -18,6 +18,12 @@ jobs:
         os: [ubuntu-latest]
         package:
           - {user: SciML, repo: ModelingToolkit.jl, group: All}
+          - {user: SciML, repo: DiffEqBase.jl, group: Core}
+          - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceI}
+          - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceII}
+          - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceIII}
+          - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceIV}
+          - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceV}
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1