CompatHelper: add new compat entry for "Vcov" at version "0.3" (#30)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

Project.toml

@@ -29,6 +29,7 @@ Reexport = "0.2"
 StatsBase = "0.33"
 StatsModels = "0.6"
 Tables = "1"
+Vcov = "0.3"
 julia = "1.3"
 
 [extras]