Bump to NLPModels 0.20 (#98)

Author: tmigot

Project.toml

@@ -13,7 +13,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 [compat]
 FastClosures = "0.2.1, 0.3.0"
 LinearOperators = "^2.5.1"
-NLPModels = "0.19"
+NLPModels = "0.19, 0.20"
 julia = "^1.6.0"
 
 [extras]