CompatHelper: bump compat for Ipopt to 1, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -13,7 +13,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-Ipopt = "0.6.5 - 0.7, 0.8"
+Ipopt = "0.6.5 - 0.7, 0.8, 1"
 MathProgBase = "0.7"
 julia = "1.6"