update textlint

Author: azu

Diff for: package.json

@@ -62,7 +62,7 @@
     "redux": "^3.5.2",
     "remark": "^4.1.1",
     "stemming-x-keywords": "^1.0.3",
-    "textlint": "^6.1.0",
+    "textlint": "^6.9.0",
     "textlint-formatter-codecov": "^1.0.2",
     "textlint-formatter-lcov": "^1.0.2",
     "textlint-rule-max-kanji-continuous-len": "^1.0.1",