Fix the ESLint peer dependency semver specifier

Fixes xojs/xo#486

Author: sindresorhus

package.json

@@ -57,7 +57,7 @@
 		"xo": "^0.24.0"
 	},
 	"peerDependencies": {
-		"eslint": "^6.2.0"
+		"eslint": ">=6.2.0"
 	},
 	"ava": {
 		"files": [