chore(deps): update hexo-util from 1.6.1 to 1.7.0

Author: curbengh

package.json

@@ -49,7 +49,7 @@
     "hexo-fs": "^2.0.0",
     "hexo-i18n": "^1.0.0",
     "hexo-log": "^1.0.0",
-    "hexo-util": "^1.6.1",
+    "hexo-util": "^1.7.0",
     "js-yaml": "^3.12.0",
     "lodash": "^4.17.11",
     "micromatch": "^4.0.2",