Merge pull request #35 from SciML/compathelper/new_version/2020-08-17-06-06-37-118-1910728172

CompatHelper: add new compat entry for "Tracker" at version "0.2"

Author: ChrisRackauckas

Project.toml

@@ -26,6 +26,7 @@ ForwardDiff = "0.10"
 Optim = "0.22"
 Requires = "1.0"
 ReverseDiff = "1.4"
+Tracker = "0.2"
 Zygote = "0.5"
 julia = "1.3"