CompatHelper: bump compat for JuMP to 1, (keep existing compat) (#8)

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>

Author: github-actions[bot]

Project.toml

@@ -12,8 +12,8 @@ SimpleTraits = "699a6c99-e7fa-54fc-8d76-47d257e15c1d"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 
 [compat]
-JuMP = "0.21"
 Graphs = "1.4"
+JuMP = "0.21, 1"
 SimpleTraits = "0.9"
 julia = "1.3"