add back optim in [compat]

haotian127 · haotian127 · commit ac63be820515 · 2021-04-24T17:51:28.000-07:00
diff --git a/Project.toml b/Project.toml
@@ -37,6 +37,7 @@ JLD2 = "0.4.3"
 JuMP = "0.20.0"
 LightGraphs = "1.3.5"
 MAT = "0.8.1"
+Optim = "1.3.0"
 Plots = "1.12.0"
 QuadGK = "2.4.1"
 Reexport = "1.0.0"
