CompatHelper: add new compat entry for OrdinaryDiffEq at version 6, (…

…keep existing compat) (#7)

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>
Co-authored-by: Jordi Bolibar <jordi.bolibar@gmail.com>

Project.toml

@@ -18,6 +18,7 @@ Sleipnir = "f5e6c550-199f-11ee-3608-394420200519"
 Tullio = "bc48ee85-29a4-5162-ae0b-a64e1601d4bc"
 
 [compat]
+OrdinaryDiffEq = "6"
 ProgressMeter = "1"
 PlotThemes = "3"
 Infiltrator = "1"