CompatHelper: add new compat entry for Graphs at version 1, (keep existing compat) (#458)

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

Author: github-actions[bot]

Project.toml

@@ -25,6 +25,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 CSV = "0.8.5, 0.9, 0.10"
 FilePaths = "0.8.3"
 Glob = "1.3"
+Graphs = "1"
 InfrastructureModels = "0.7.3, 0.7.5"
 Ipopt = "0.9, 1.0.2, 1.1"
 JSON = "0.18, 0.19, 0.20, 0.21"