chore(ci): fix workflow

Author: uetchy

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Install dependencies
         run: yarn install
       - name: textlint
-        run: $(yarn bin)/textlint -f checkstyle "${FILES}" | reviewdog -f=checkstyle -name="textlint" -reporter=github-pr-check -level=${LEVEL}
+        run: $(yarn bin)/textlint -f checkstyle ${FILES} | reviewdog -f=checkstyle -name="textlint" -reporter=github-pr-check -level=${LEVEL}
         env:
           REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           FILES: README.md docs/**/*.md