Add eslint v8 peerDependencies support

Author: ntwb

packages/eslint-config-humanmade/package.json

@@ -45,7 +45,7 @@
 	},
 	"peerDependencies": {
 		"babel-eslint": "^10.0.0",
-		"eslint": "^5.10.0 || ^6.0.0 || ^7.0.0",
+		"eslint": "^5.10.0 || ^6.0.0 || ^7.0.0 || ^8.0.0",
 		"eslint-config-react-app": "^3.0.5",
 		"eslint-plugin-flowtype": "^3.2.0",
 		"eslint-plugin-import": "^2.14.0",