Configure solhint for solc 0.7

.solhint.json

@@ -6,6 +6,7 @@
     "no-empty-blocks": "off",
     "compiler-version": ["error", "^0.7.0"],
     "private-vars-leading-underscore": "error",
-    "reason-string": "off"
+    "reason-string": "off",
+    "func-visibility": ["error", { "ignoreConstructors": true }]
   }
 }