Update deps and compat

Author: ranjanan

Project.toml

@@ -14,9 +14,10 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-Compat = "≥ 1.0.0"
-IterativeSolvers = "≥ 0.6.0"
-julia = "≥ 1.0.0"
+Compat = "3.0.0"
+CompatHelper = "1.3.0"
+IterativeSolvers = "0.8.3"
+julia = "1.4.0"
 
 [extras]
 FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"