chore(deps): update dependency textlint-tester to v4

Author: renovate-bot

package.json

@@ -40,7 +40,7 @@
     "eslint": "4.7.2",
     "mocha": "5.2.0",
     "power-assert": "1.6.0",
-    "textlint-tester": "2.2.4"
+    "textlint-tester": "4.1.3"
   },
   "peerDependencies": {
     "eslint": "^3.0.0 || ^4.0.0"