chore(package): update remark-usage to version 8.0.0

Author: greenkeeper[bot]

package.json

@@ -82,7 +82,7 @@
     "remark-cli": "^7.0.1",
     "remark-preset-lint-travi": "^1.3.0",
     "remark-toc": "^7.0.0",
-    "remark-usage": "^7.0.1",
+    "remark-usage": "^8.0.0",
     "rollup": "^2.0.2",
     "rollup-plugin-babel": "^4.4.0",
     "sinon": "^9.0.0",