Merge pull request #122 from JuliaDiffEq/compathelper/new_version/2019-11-27-11-06-06-087-49639765

CompatHelper: bump compat for "Plots" to "0.28"

Author: ChrisRackauckas

Project.toml

@@ -73,7 +73,7 @@ NLsolve = "4.2"
 Optim = "0.19"
 OrdinaryDiffEq = "5.23"
 ParameterizedFunctions = "4.2"
-Plots = "0.27"
+Plots = "0.27, 0.28"
 PyPlot = "2.8"
 RecursiveArrayTools = "1.0"
 SparseDiffTools = "0.10"