Merge pull request #81 from JuliaLinearAlgebra/compathelper/new_version/2021-08-15-00-41-16-876-02866769474

CompatHelper: bump compat for CompatHelper to 3, (keep existing compat)

Author: ranjanan

Project.toml

@@ -13,7 +13,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-CompatHelper = "1.3.0, 2.1"
+CompatHelper = "1.3.0, 2.1, 3"
 IterativeSolvers = "0.9"
 julia = "1.4.0"