Fix: support eslint v6

refs: #95 (comment)

Author: aladdin-add

package.json

@@ -58,7 +58,7 @@
     "nyc": "^15.1.0"
   },
   "peerDependencies": {
-    "eslint": "^7.0.0"
+    "eslint": ">=6.0.0"
   },
   "engines": {
     "node": "^10.12.0 || >=12.0.0"